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

chrome/browser/ui/tab_contents/core_tab_helper.cc

 // 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.
 
 #include "chrome/browser/ui/tab_contents/core_tab_helper.h"
 
 #include <string>
 #include <vector>
 
 #include "base/command_line.h"
@@ skipping 162 matching lines @@
   if (!guest_manager)
     return false;
   return guest_manager->ForEachGuest(
       source, base::Bind(&CoreTabHelper::GetStatusTextForWebContents,
                          status_text));
 }
 
 ////////////////////////////////////////////////////////////////////////////////
 // WebContentsObserver overrides
 
-void CoreTabHelper::DidStartLoading(content::RenderViewHost* render_view_host) {
+void CoreTabHelper::DidStartLoading() {
   UpdateContentRestrictions(0);
 }
 
 void CoreTabHelper::WasShown() {
   web_cache::WebCacheManager::GetInstance()->ObserveActivity(
       web_contents()->GetRenderProcessHost()->GetID());
 }
 
 void CoreTabHelper::WebContentsDestroyed() {
   // OnCloseStarted isn't called in unit tests.
@@ skipping 88 matching lines @@
     DCHECK(!content_type.empty());
     open_url_params.uses_post = true;
     open_url_params.browser_initiated_post_data =
         base::RefCountedString::TakeString(post_data);
     open_url_params.extra_headers += base::StringPrintf(
         "%s: %s\r\n", net::HttpRequestHeaders::kContentType,
         content_type.c_str());
   }
   web_contents()->OpenURL(open_url_params);
 }