chrome: Cleanup class/struct forward declarations

chrome/test/base/in_process_browser_test.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_TEST_BASE_IN_PROCESS_BROWSER_TEST_H_
 #define CHROME_TEST_BASE_IN_PROCESS_BROWSER_TEST_H_
 
 #include <memory>
 
 #include "base/compiler_specific.h"
@@ skipping 22 matching lines @@
 }
 #endif  // defined(OS_WIN)
 }  // namespace base
 
 class Browser;
 class Profile;
 #if defined(OS_MACOSX)
 class ScopedBundleSwizzlerMac;
 #endif  // defined(OS_MACOSX)
 
-namespace content {
-class ContentRendererClient;
-}
-
 // Base class for tests wanting to bring up a browser in the unit test process.
 // Writing tests with InProcessBrowserTest is slightly different than that of
 // other tests. This is necessitated by InProcessBrowserTest running a message
 // loop. To use InProcessBrowserTest do the following:
 // . Use the macro IN_PROC_BROWSER_TEST_F to define your test.
 // . Your test method is invoked on the ui thread. If you need to block until
 //   state changes you'll need to run the message loop from your test method.
 //   For example, if you need to wait till a find bar has completely been shown
 //   you'll need to invoke content::RunMessageLoop. When the message bar is
 //   shown, invoke MessageLoop::current()->QuitWhenIdle() to return control back
@@ skipping 211 matching lines @@
   base::mac::ScopedNSAutoreleasePool* autorelease_pool_;
   std::unique_ptr<ScopedBundleSwizzlerMac> bundle_swizzler_;
 #endif  // OS_MACOSX
 
 #if defined(OS_WIN)
   std::unique_ptr<base::win::ScopedCOMInitializer> com_initializer_;
 #endif
 };
 
 #endif  // CHROME_TEST_BASE_IN_PROCESS_BROWSER_TEST_H_