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

chrome/browser/prerender/prerender_tab_helper.h

 // Copyright (c) 2012 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 CHROME_BROWSER_PRERENDER_PRERENDER_TAB_HELPER_H_
 #define CHROME_BROWSER_PRERENDER_PRERENDER_TAB_HELPER_H_
 
 #include "base/memory/scoped_ptr.h"
 #include "base/memory/weak_ptr.h"
 #include "base/time/time.h"
@@ skipping 32 matching lines @@
     EVENT_LOGIN_ACTION_ADDED_PW_EMPTY = 7,
     EVENT_MAX_VALUE
   };
 
   ~PrerenderTabHelper() override;
 
   // content::WebContentsObserver implementation.
   void DidGetRedirectForResourceRequest(
       content::RenderFrameHost* render_frame_host,
       const content::ResourceRedirectDetails& details) override;
-  void DidStopLoading(content::RenderViewHost* render_view_host) override;
+  void DidStopLoading() override;
   void DidStartProvisionalLoadForFrame(
       content::RenderFrameHost* render_frame_host,
       const GURL& validated_url,
       bool is_error_page,
       bool is_iframe_srcdoc) override;
   void DidCommitProvisionalLoadForFrame(
       content::RenderFrameHost* render_frame_host,
       const GURL& validated_url,
       ui::PageTransition transition_type) override;
 
@@ skipping 59 matching lines @@
   GURL url_;
 
   base::WeakPtrFactory<PrerenderTabHelper> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(PrerenderTabHelper);
 };
 
 }  // namespace prerender
 
 #endif  // CHROME_BROWSER_PRERENDER_PRERENDER_TAB_HELPER_H_