Get rid of the last RenderViewHostDelegate usage in chrome.

chrome/browser/debugger/devtools_window.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 <algorithm>
 
 #include "base/command_line.h"
 #include "base/json/json_writer.h"
 #include "base/lazy_instance.h"
 #include "base/string_number_conversions.h"
@@ skipping 208 matching lines @@
       chrome::NOTIFICATION_TAB_CLOSING,
       content::Source<NavigationController>(
           &tab_contents_->web_contents()->GetController()));
   registrar_.Add(
       this,
       chrome::NOTIFICATION_BROWSER_THEME_CHANGED,
       content::Source<ThemeService>(
           ThemeServiceFactory::GetForProfile(profile_)));
   // There is no inspected_rvh in case of shared workers.
   if (inspected_rvh) {
-    WebContents* tab = inspected_rvh->GetDelegate()->GetAsWebContents();
+    WebContents* tab = WebContents::FromRenderViewHost(inspected_rvh);
     if (tab)
       inspected_tab_ = TabContentsWrapper::GetCurrentWrapperForContents(tab);
   }
 }
 
 DevToolsWindow::~DevToolsWindow() {
   DevToolsWindowList& instances = g_instances.Get();
   DevToolsWindowList::iterator it = std::find(instances.begin(),
                                               instances.end(),
                                               this);
@@ skipping 515 matching lines @@
   CallClientFunction("InspectorFrontendAPI.appendedToURL", &url_value);
 }
 
 content::JavaScriptDialogCreator* DevToolsWindow::GetJavaScriptDialogCreator() {
   if (inspected_tab_ && inspected_tab_->web_contents()->GetDelegate()) {
     return inspected_tab_->web_contents()->GetDelegate()->
         GetJavaScriptDialogCreator();
   }
   return content::WebContentsDelegate::GetJavaScriptDialogCreator();
 }