diff --git a/protos/protos.cc b/protos/protos.cc
deleted file mode 100644
index fedbb6bc30cb2..0000000000000
--- a/protos/protos.cc
+++ /dev/null
@@ -1,185 +0,0 @@
-// Protocol Buffers - Google's data interchange format
-// Copyright 2023 Google LLC.  All rights reserved.
-//
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file or at
-// https://developers.google.com/open-source/licenses/bsd
-
-#include "protos/protos.h"
-
-#include <atomic>
-#include <cstddef>
-
-#include "absl/status/status.h"
-#include "absl/status/statusor.h"
-#include "absl/strings/str_format.h"
-#include "absl/strings/string_view.h"
-#include "protos/protos_extension_lock.h"
-#include "upb/mem/arena.h"
-#include "upb/message/accessors.h"
-#include "upb/message/copy.h"
-#include "upb/message/message.h"
-#include "upb/message/promote.h"
-#include "upb/message/value.h"
-#include "upb/mini_table/extension.h"
-#include "upb/mini_table/extension_registry.h"
-#include "upb/mini_table/message.h"
-#include "upb/wire/decode.h"
-#include "upb/wire/encode.h"
-
-namespace protos {
-
-// begin:google_only
-// absl::Status MessageAllocationError(SourceLocation loc) {
-//   return absl::Status(absl::StatusCode::kInternal,
-//                       "Upb message allocation error", loc);
-// }
-//
-// absl::Status ExtensionNotFoundError(int extension_number, SourceLocation loc) {
-//   return absl::Status(
-//       absl::StatusCode::kInternal,
-//       absl::StrFormat("Extension %d not found", extension_number), loc);
-// }
-//
-// absl::Status MessageEncodeError(upb_EncodeStatus status, SourceLocation loc) {
-//   return absl::Status(absl::StatusCode::kInternal,
-//                       absl::StrFormat("Upb message encoding error %d", status),
-//                       loc
-//
-//   );
-// }
-//
-// absl::Status MessageDecodeError(upb_DecodeStatus status, SourceLocation loc
-//
-// ) {
-//   return absl::Status(absl::StatusCode::kInternal,
-//                       absl::StrFormat("Upb message parse error %d", status), loc
-//
-//   );
-// }
-// end:google_only
-
-// begin:github_only
-absl::Status MessageAllocationError(SourceLocation loc) {
-  return absl::Status(absl::StatusCode::kUnknown,
-                      "Upb message allocation error");
-}
-
-absl::Status ExtensionNotFoundError(int ext_number, SourceLocation loc) {
-  return absl::Status(absl::StatusCode::kUnknown,
-                      absl::StrFormat("Extension %d not found", ext_number));
-}
-
-absl::Status MessageEncodeError(upb_EncodeStatus s, SourceLocation loc) {
-  return absl::Status(absl::StatusCode::kUnknown, "Encoding error");
-}
-
-absl::Status MessageDecodeError(upb_DecodeStatus status, SourceLocation loc
-
-) {
-  return absl::Status(absl::StatusCode::kUnknown, "Upb message parse error");
-}
-// end:github_only
-
-namespace internal {
-
-upb_ExtensionRegistry* GetUpbExtensions(
-    const ExtensionRegistry& extension_registry) {
-  return extension_registry.registry_;
-}
-
-/**
- * MessageLock(msg) acquires lock on msg when constructed and releases it when
- * destroyed.
- */
-class MessageLock {
- public:
-  explicit MessageLock(const upb_Message* msg) : msg_(msg) {
-    UpbExtensionLocker locker =
-        upb_extension_locker_global.load(std::memory_order_acquire);
-    unlocker_ = (locker != nullptr) ? locker(msg) : nullptr;
-  }
-  MessageLock(const MessageLock&) = delete;
-  void operator=(const MessageLock&) = delete;
-  ~MessageLock() {
-    if (unlocker_ != nullptr) {
-      unlocker_(msg_);
-    }
-  }
-
- private:
-  const upb_Message* msg_;
-  UpbExtensionUnlocker unlocker_;
-};
-
-bool HasExtensionOrUnknown(const upb_Message* msg,
-                           const upb_MiniTableExtension* eid) {
-  MessageLock msg_lock(msg);
-  if (upb_Message_HasExtension(msg, eid)) return true;
-
-  const int number = upb_MiniTableExtension_Number(eid);
-  return upb_Message_FindUnknown(msg, number, 0).status == kUpb_FindUnknown_Ok;
-}
-
-bool GetOrPromoteExtension(upb_Message* msg, const upb_MiniTableExtension* eid,
-                           upb_Arena* arena, upb_MessageValue* value) {
-  MessageLock msg_lock(msg);
-  upb_GetExtension_Status ext_status = upb_Message_GetOrPromoteExtension(
-      (upb_Message*)msg, eid, 0, arena, value);
-  return ext_status == kUpb_GetExtension_Ok;
-}
-
-absl::StatusOr<absl::string_view> Serialize(const upb_Message* message,
-                                            const upb_MiniTable* mini_table,
-                                            upb_Arena* arena, int options) {
-  MessageLock msg_lock(message);
-  size_t len;
-  char* ptr;
-  upb_EncodeStatus status =
-      upb_Encode(message, mini_table, options, arena, &ptr, &len);
-  if (status == kUpb_EncodeStatus_Ok) {
-    return absl::string_view(ptr, len);
-  }
-  return MessageEncodeError(status);
-}
-
-void DeepCopy(upb_Message* target, const upb_Message* source,
-              const upb_MiniTable* mini_table, upb_Arena* arena) {
-  MessageLock msg_lock(source);
-  upb_Message_DeepCopy(target, source, mini_table, arena);
-}
-
-upb_Message* DeepClone(const upb_Message* source,
-                       const upb_MiniTable* mini_table, upb_Arena* arena) {
-  MessageLock msg_lock(source);
-  return upb_Message_DeepClone(source, mini_table, arena);
-}
-
-absl::Status MoveExtension(upb_Message* message, upb_Arena* message_arena,
-                           const upb_MiniTableExtension* ext,
-                           upb_Message* extension, upb_Arena* extension_arena) {
-  if (message_arena != extension_arena &&
-      // Try fuse, if fusing is not allowed or fails, create copy of extension.
-      !upb_Arena_Fuse(message_arena, extension_arena)) {
-    extension = DeepClone(extension, upb_MiniTableExtension_GetSubMessage(ext),
-                          message_arena);
-  }
-  return upb_Message_SetExtension(message, ext, &extension, message_arena)
-             ? absl::OkStatus()
-             : MessageAllocationError();
-}
-
-absl::Status SetExtension(upb_Message* message, upb_Arena* message_arena,
-                          const upb_MiniTableExtension* ext,
-                          const upb_Message* extension) {
-  // Clone extension into target message arena.
-  extension = DeepClone(extension, upb_MiniTableExtension_GetSubMessage(ext),
-                        message_arena);
-  return upb_Message_SetExtension(message, ext, &extension, message_arena)
-             ? absl::OkStatus()
-             : MessageAllocationError();
-}
-
-}  // namespace internal
-
-}  // namespace protos