Add abstractions that let embedders drive tests of WebContents.

chrome/browser/ui/tab_contents/test_tab_contents_wrapper.h

-// Copyright (c) 2011 The Chromium Authors. All rights reserved.
+// 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_UI_TAB_CONTENTS_TEST_TAB_CONTENTS_WRAPPER_H_
 #define CHROME_BROWSER_UI_TAB_CONTENTS_TEST_TAB_CONTENTS_WRAPPER_H_
 #pragma once
 
 #include "base/compiler_specific.h"
 #include "chrome/test/base/chrome_render_view_host_test_harness.h"
 
 class TabContentsWrapper;
 
+namespace content {
+class WebContents;
+}
+
 class TabContentsWrapperTestHarness : public ChromeRenderViewHostTestHarness {
  public:
   TabContentsWrapperTestHarness();
   virtual ~TabContentsWrapperTestHarness();
 
-  virtual TestTabContents* contents() OVERRIDE;
+  virtual content::WebContents* web_contents() OVERRIDE;
   TabContentsWrapper* contents_wrapper();
 
-  virtual void SetContents(TestTabContents* contents) OVERRIDE;
+  virtual void SetContents(content::WebContents* contents) OVERRIDE;
 
  protected:
   // testing::Test
   virtual void SetUp() OVERRIDE;
   virtual void TearDown() OVERRIDE;
 
   scoped_ptr<TabContentsWrapper> contents_wrapper_;
 
   DISALLOW_COPY_AND_ASSIGN(TabContentsWrapperTestHarness);
 };
 
 #endif  // CHROME_BROWSER_UI_TAB_CONTENTS_TEST_TAB_CONTENTS_WRAPPER_H_