Add abstractions that let embedders drive tests of WebContents.

chrome/browser/tabs/tab_strip_model_delegate.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_TABS_TAB_STRIP_MODEL_DELEGATE_H_
 #define CHROME_BROWSER_TABS_TAB_STRIP_MODEL_DELEGATE_H_
 #pragma once
 
 #include <vector>
 
 #include "content/public/common/page_transition_types.h"
 
 class Browser;
 class DockInfo;
 class GURL;
 class Profile;
-class TabContents;
 class TabContentsWrapper;
 namespace content {
 class SiteInstance;
 struct Referrer;
 }
 namespace gfx {
 class Rect;
 }
 
 ///////////////////////////////////////////////////////////////////////////////
@@ skipping 90 matching lines @@
   virtual bool CanCloseTab() const = 0;
 
   // Returns true if the tab strip can use large icons.
   virtual bool LargeIconsPermitted() const = 0;
 
  protected:
   virtual ~TabStripModelDelegate() {}
 };
 
 #endif  // CHROME_BROWSER_TABS_TAB_STRIP_MODEL_DELEGATE_H_