content: Cleanup class/struct forward declarations

content/shell/renderer/layout_test/blink_test_runner.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 CONTENT_SHELL_RENDERER_LAYOUT_TEST_BLINK_TEST_RUNNER_H_
 #define CONTENT_SHELL_RENDERER_LAYOUT_TEST_BLINK_TEST_RUNNER_H_
 
 #include <deque>
 #include <memory>
 #include <vector>
 
 #include "base/callback.h"
 #include "base/files/file_path.h"
 #include "base/macros.h"
 #include "components/test_runner/test_preferences.h"
 #include "components/test_runner/web_test_delegate.h"
 #include "content/public/common/page_state.h"
 #include "content/public/renderer/render_view_observer.h"
 #include "content/public/renderer/render_view_observer_tracker.h"
 #include "content/shell/common/layout_test/layout_test_bluetooth_fake_adapter_setter.mojom.h"
 #include "content/shell/common/shell_test_configuration.h"
 #include "v8/include/v8.h"
 
 class SkBitmap;
-class SkCanvas;
 
 namespace base {
 class DictionaryValue;
 }
 
 namespace blink {
 class WebDeviceMotionData;
 class WebDeviceOrientationData;
 class WebView;
-struct WebRect;
 }
 
 namespace test_runner {
 class AppBannerService;
-class WebViewTestProxyBase;
 }
 
 namespace content {
 
 class LeakDetector;
 struct LeakDetectionResult;
 
 // This is the renderer side of the webkit test runner.
 // TODO(lukasza): Rename to LayoutTestRenderViewObserver for consistency with
 // LayoutTestRenderFrameObserver.
@@ skipping 173 matching lines @@
   std::unique_ptr<test_runner::AppBannerService> app_banner_service_;
 
   std::unique_ptr<LeakDetector> leak_detector_;
 
   DISALLOW_COPY_AND_ASSIGN(BlinkTestRunner);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_SHELL_RENDERER_LAYOUT_TEST_BLINK_TEST_RUNNER_H_