content: Cleanup class/struct forward declarations

content/browser/android/synchronous_compositor_host.h

 // Copyright 2015 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_BROWSER_ANDROID_SYNCHRONOUS_COMPOSITOR_HOST_H_
 #define CONTENT_BROWSER_ANDROID_SYNCHRONOUS_COMPOSITOR_HOST_H_
 
 #include <stddef.h>
 #include <stdint.h>
 
@@ skipping 17 matching lines @@
 namespace ui {
 class WindowAndroid;
 struct DidOverscrollParams;
 }
 
 namespace content {
 
 class RenderWidgetHostViewAndroid;
 class SynchronousCompositorClient;
 class SynchronousCompositorBrowserFilter;
-class WebContents;
 struct SyncCompositorCommonRendererParams;
 
 class SynchronousCompositorHost : public SynchronousCompositor {
  public:
   static std::unique_ptr<SynchronousCompositorHost> Create(
       RenderWidgetHostViewAndroid* rwhva);
 
   ~SynchronousCompositorHost() override;
 
   // SynchronousCompositor overrides.
@@ skipping 63 matching lines @@
   bool need_animate_scroll_;
   uint32_t need_invalidate_count_;
   uint32_t did_activate_pending_tree_count_;
 
   DISALLOW_COPY_AND_ASSIGN(SynchronousCompositorHost);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_ANDROID_SYNCHRONOUS_COMPOSITOR_HOST_H_