Remove forward declarations of non-existent class.

content/public/browser/android/synchronous_compositor_client.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_PUBLIC_BROWSER_ANDROID_SYNCHRONOUS_COMPOSITOR_CLIENT_H_
 #define CONTENT_PUBLIC_BROWSER_ANDROID_SYNCHRONOUS_COMPOSITOR_CLIENT_H_
 
 #include "base/callback_forward.h"
 #include "base/macros.h"
 #include "base/time/time.h"
@@ skipping 14 matching lines @@
                                        int routing_id) = 0;
 
   // Indication to the client that |compositor| is going out of scope, and
   // must not be accessed within or after this call.
   // NOTE if the client goes away before the compositor it must call
   // SynchronousCompositor::SetClient(nullptr) to release the back pointer.
   virtual void DidDestroyCompositor(SynchronousCompositor* compositor,
                                     int process_id,
                                     int routing_id) = 0;
 
-  // See LayerScrollOffsetDelegate for details.
   virtual void UpdateRootLayerState(SynchronousCompositor* compositor,
                                     const gfx::Vector2dF& total_scroll_offset,
                                     const gfx::Vector2dF& max_scroll_offset,
                                     const gfx::SizeF& scrollable_size,
                                     float page_scale_factor,
                                     float min_page_scale_factor,
                                     float max_page_scale_factor) = 0;
 
   virtual void DidOverscroll(SynchronousCompositor* compositor,
                              const gfx::Vector2dF& accumulated_overscroll,
                              const gfx::Vector2dF& latest_overscroll_delta,
                              const gfx::Vector2dF& current_fling_velocity) = 0;
 
   virtual void PostInvalidate(SynchronousCompositor* compositor) = 0;
 
   virtual void DidUpdateContent(SynchronousCompositor* compositor) = 0;
 
  protected:
   SynchronousCompositorClient() {}
   virtual ~SynchronousCompositorClient() {}
 
  private:
   DISALLOW_COPY_AND_ASSIGN(SynchronousCompositorClient);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_PUBLIC_BROWSER_ANDROID_SYNCHRONOUS_COMPOSITOR_CLIENT_H_