Revert of Signal extension API schema corruption to the browser process.

extensions/browser/extension_message_filter.h

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef EXTENSIONS_BROWSER_EXTENSION_MESSAGE_FILTER_H_
 #define EXTENSIONS_BROWSER_EXTENSION_MESSAGE_FILTER_H_
 
 #include <string>
 #include <vector>
 
@@ skipping 62 matching lines @@
   void OnExtensionRemoveFilteredListener(const std::string& extension_id,
                                          const std::string& event_name,
                                          const base::DictionaryValue& filter,
                                          bool lazy);
   void OnExtensionShouldSuspendAck(const std::string& extension_id,
                                    int sequence_id);
   void OnExtensionSuspendAck(const std::string& extension_id);
   void OnExtensionTransferBlobsAck(const std::vector<std::string>& blob_uuids);
   void OnExtensionWakeEventPage(int request_id,
                                 const std::string& extension_id);
-  void OnExtensionNotifyBadExtensionApiSchema(const std::string& api);
 
   // Responds to the ExtensionHostMsg_WakeEventPage message.
   void SendWakeEventPageResponse(int request_id, bool success);
 
   const int render_process_id_;
 
   std::unique_ptr<KeyedServiceShutdownNotifier::Subscription>
       shutdown_notifier_;
 
   // Only access from the UI thread.
   content::BrowserContext* browser_context_;
 
   DISALLOW_COPY_AND_ASSIGN(ExtensionMessageFilter);
 };
 
 }  // namespace extensions
 
 #endif  // EXTENSIONS_BROWSER_EXTENSION_MESSAGE_FILTER_H_