Remove RenderViewHost parameter from WebContentsObserver::Did{Start|Stop}Loading.

extensions/browser/extension_host.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_HOST_H_
 #define EXTENSIONS_BROWSER_EXTENSION_HOST_H_
 
 #include <set>
 #include <string>
 
@@ skipping 85 matching lines @@
   // finished.
   void OnNetworkRequestDone(uint64 request_id);
 
   // content::WebContentsObserver:
   bool OnMessageReceived(const IPC::Message& message) override;
   void RenderViewCreated(content::RenderViewHost* render_view_host) override;
   void RenderViewDeleted(content::RenderViewHost* render_view_host) override;
   void RenderViewReady() override;
   void RenderProcessGone(base::TerminationStatus status) override;
   void DocumentAvailableInMainFrame() override;
-  void DidStartLoading(content::RenderViewHost* render_view_host) override;
-  void DidStopLoading(content::RenderViewHost* render_view_host) override;
+  void DidStartLoading() override;
+  void DidStopLoading() override;
 
   // content::WebContentsDelegate:
   content::JavaScriptDialogManager* GetJavaScriptDialogManager(
       content::WebContents* source) override;
   void AddNewContents(content::WebContents* source,
                       content::WebContents* new_contents,
                       WindowOpenDisposition disposition,
                       const gfx::Rect& initial_rect,
                       bool user_gesture,
                       bool* was_blocked) override;
@@ skipping 85 matching lines @@
   ObserverList<ExtensionHostObserver> observer_list_;
   ObserverList<DeferredStartRenderHostObserver>
       deferred_start_render_host_observer_list_;
 
   DISALLOW_COPY_AND_ASSIGN(ExtensionHost);
 };
 
 }  // namespace extensions
 
 #endif  // EXTENSIONS_BROWSER_EXTENSION_HOST_H_