Remove dead extensions tracking code.

extensions/renderer/dispatcher.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_RENDERER_DISPATCHER_H_
 #define EXTENSIONS_RENDERER_DISPATCHER_H_
 
 #include <stdint.h>
 
 #include <map>
@@ skipping 131 matching lines @@
 
   // Returns a list of (module name, resource id) pairs for the JS modules to
   // add to the source map.
   static std::vector<std::pair<std::string, int> > GetJsResources();
   static void RegisterNativeHandlers(ModuleSystem* module_system,
                                      ScriptContext* context,
                                      Dispatcher* dispatcher,
                                      RequestSender* request_sender,
                                      V8SchemaRegistry* v8_schema_registry);
 
-  bool WasWebRequestUsedBySomeExtensions() const { return webrequest_used_; }
-
  private:
   // The RendererPermissionsPolicyDelegateTest.CannotScriptWebstore test needs
   // to call the OnActivateExtension IPCs.
   friend class ::ChromeRenderViewTest;
   FRIEND_TEST_ALL_PREFIXES(RendererPermissionsPolicyDelegateTest,
                            CannotScriptWebstore);
 
   // RenderThreadObserver implementation:
   bool OnControlMessageReceived(const IPC::Message& message) override;
   void IdleNotification() override;
@@ skipping 31 matching lines @@
   void OnUpdatePermissions(const ExtensionMsg_UpdatePermissions_Params& params);
   void OnUpdateTabSpecificPermissions(const GURL& visible_url,
                                       const std::string& extension_id,
                                       const URLPatternSet& new_hosts,
                                       bool update_origin_whitelist,
                                       int tab_id);
   void OnClearTabSpecificPermissions(
       const std::vector<std::string>& extension_ids,
       bool update_origin_whitelist,
       int tab_id);
-  void OnUsingWebRequestAPI(bool webrequest_used);
+
   void OnSetActivityLoggingEnabled(bool enabled);
 
   // UserScriptSetManager::Observer implementation.
   void OnUserScriptsUpdated(const std::set<HostID>& changed_hosts) override;
 
   void UpdateActiveExtensions();
 
   // Sets up the host permissions for |extension|.
   void InitOriginPermissions(const Extension* extension);
 
@@ skipping 87 matching lines @@
 
   // The platforms system font family and size;
   std::string system_font_family_;
   std::string system_font_size_;
 
   // It is important for this to come after the ScriptInjectionManager, so that
   // the observer is destroyed before the UserScriptSet.
   ScopedObserver<UserScriptSetManager, UserScriptSetManager::Observer>
       user_script_set_manager_observer_;
 
-  // Status of webrequest usage.
-  bool webrequest_used_;
-
   // Whether or not extension activity is enabled.
   bool activity_logging_enabled_;
 
   // The WebView partition ID associated with this process's storage partition,
   // if this renderer is a WebView guest render process. Otherwise, this will be
   // empty.
   std::string webview_partition_id_;
 
   DISALLOW_COPY_AND_ASSIGN(Dispatcher);
 };
 
 }  // namespace extensions
 
 #endif  // EXTENSIONS_RENDERER_DISPATCHER_H_