Make an empty content browser test work.

content/test/content_browser_test.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_TEST_CONTENT_BROWSER_TEST_H_
 #define CONTENT_TEST_CONTENT_BROWSER_TEST_H_
 #pragma once
 
 #include "base/memory/scoped_ptr.h"
-#include "content/browser/mock_content_browser_client.h"
 #include "content/test/browser_test_base.h"
 
-namespace content {
-class ContentBrowserClient;
-class ContentClient;
-}
+class ShellMainDelegate;
 
 class ContentBrowserTest : public BrowserTestBase {
  protected:
   ContentBrowserTest();
   virtual ~ContentBrowserTest();
 
   // testing::Test:
   virtual void SetUp() OVERRIDE;
   virtual void TearDown() OVERRIDE;
 
   // BrowserTestBase:
   virtual void RunTestOnMainThreadLoop() OVERRIDE;
 
  private:
-  scoped_ptr<content::ContentClient> content_client_;
-  scoped_ptr<content::ContentBrowserClient> content_browser_client_;
+  scoped_ptr<ShellMainDelegate> shell_main_delegate_;
 };
 
 #endif  // CONTENT_TEST_CONTENT_BROWSER_TEST_H_