Clean up TCW, make it solely a hub for 1:1 observer/helper objects.

chrome/browser/extensions/extension_devtools_bridge.cc

 // Copyright (c) 2011 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/extensions/extension_devtools_bridge.h"
 
 #include "base/json/json_writer.h"
 #include "base/message_loop.h"
 #include "base/string_util.h"
 #include "base/stringprintf.h"
@@ skipping 43 matching lines @@
 
   Browser* browser;
   TabStripModel* tab_strip;
   TabContentsWrapper* contents;
   int tab_index;
   if (ExtensionTabUtil::GetTabById(tab_id_, profile_, true,
                                    &browser, &tab_strip,
                                    &contents, &tab_index)) {
     DevToolsManager* devtools_manager = DevToolsManager::GetInstance();
     DevToolsAgentHost* agent = DevToolsAgentHostRegistry::GetDevToolsAgentHost(
-        contents->render_view_host());
+        contents->tab_contents()->render_view_host());
     if (devtools_manager->GetDevToolsClientHostFor(agent))
       return false;
 
     devtools_manager->RegisterDevToolsClientHostFor(agent, this);
 
     // Following messages depend on inspector protocol that is not yet
     // finalized.
 
     // 1. Start timeline profiler.
     devtools_manager->DispatchOnInspectorBackend(
@@ skipping 36 matching lines @@
 
   std::string json = base::StringPrintf("[%s]", data.c_str());
   profile_->GetExtensionEventRouter()->DispatchEventToRenderers(
       on_page_event_name_, json, profile_, GURL());
 }
 
 void ExtensionDevToolsBridge::TabReplaced(TabContents* new_tab) {
   // We don't update the tab id as it needs to remain the same so that we can
   // properly unregister.
 }