Move most of the remaining users of WebContentsObserver::tab_contents() to use web_contents().

content/browser/tab_contents/tab_contents.h

 // 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.
 
 #ifndef CONTENT_BROWSER_TAB_CONTENTS_TAB_CONTENTS_H_
 #define CONTENT_BROWSER_TAB_CONTENTS_TAB_CONTENTS_H_
 #pragma once
 
 #include <deque>
 #include <map>
@@ skipping 216 matching lines @@
   virtual TabContents* OpenURL(const OpenURLParams& params) OVERRIDE;
 
   // RenderViewHostDelegate ----------------------------------------------------
 
   virtual RenderViewHostDelegate::View* GetViewDelegate() OVERRIDE;
   virtual RenderViewHostDelegate::RendererManagement*
       GetRendererManagementDelegate() OVERRIDE;
   virtual bool OnMessageReceived(const IPC::Message& message) OVERRIDE;
   virtual const GURL& GetURL() const OVERRIDE;
   virtual TabContents* GetAsTabContents() OVERRIDE;
+  virtual WebContents* GetAsWebContents() OVERRIDE;
   virtual content::ViewType GetRenderViewType() const OVERRIDE;
   virtual void RenderViewCreated(RenderViewHost* render_view_host) OVERRIDE;
   virtual void RenderViewReady(RenderViewHost* render_view_host) OVERRIDE;
   virtual void RenderViewGone(RenderViewHost* render_view_host,
                               base::TerminationStatus status,
                               int error_code) OVERRIDE;
   virtual void RenderViewDeleted(RenderViewHost* render_view_host) OVERRIDE;
   virtual void DidNavigate(
       RenderViewHost* render_view_host,
       const ViewHostMsg_FrameNavigate_Params& params) OVERRIDE;
@@ skipping 397 matching lines @@
   // (full-page plugins for now only) permissions.
   int content_restrictions_;
 
   // Our view type. Default is VIEW_TYPE_TAB_CONTENTS.
   content::ViewType view_type_;
 
   DISALLOW_COPY_AND_ASSIGN(TabContents);
 };
 
 #endif  // CONTENT_BROWSER_TAB_CONTENTS_TAB_CONTENTS_H_