content: Cleanup class/struct forward declarations

content/test/test_blink_web_unit_test_support.h

 // Copyright 2013 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_TEST_BLINK_WEB_UNIT_TEST_SUPPORT_H_
 #define CONTENT_TEST_TEST_BLINK_WEB_UNIT_TEST_SUPPORT_H_
 
 #include <memory>
 
 #include "base/compiler_specific.h"
 #include "base/files/scoped_temp_dir.h"
 #include "base/macros.h"
 #include "build/build_config.h"
 #include "cc/blink/web_compositor_support_impl.h"
 #include "content/child/blink_platform_impl.h"
 #include "content/child/simple_webmimeregistry_impl.h"
 #include "content/child/webfileutilities_impl.h"
 #include "content/test/mock_webblob_registry_impl.h"
 #include "content/test/mock_webclipboard_impl.h"
 #include "third_party/WebKit/public/platform/WebURLLoaderMockFactory.h"
 
-namespace base {
-class StatsTable;
-}
-
-namespace blink {
-class WebLayerTreeView;
-}
-
 namespace blink {
 namespace scheduler {
 class RendererScheduler;
 }
 }
 
 namespace cc {
 class TestSharedBitmapManager;
 }
 
@@ skipping 62 matching lines @@
 
 #if defined(OS_WIN) || defined(OS_MACOSX)
   blink::WebThemeEngine* active_theme_engine_ = nullptr;
 #endif
   DISALLOW_COPY_AND_ASSIGN(TestBlinkWebUnitTestSupport);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_TEST_TEST_BLINK_WEB_UNIT_TEST_SUPPORT_H_