ui: Cleanup class/struct forward declarations

ui/gfx/blit.h

 // Copyright (c) 2011 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 UI_GFX_BLIT_H_
 #define UI_GFX_BLIT_H_
 
 #include "ui/gfx/gfx_export.h"
 #include "ui/gfx/native_widget_types.h"
 
 class SkCanvas;
 
 namespace gfx {
 
-class Point;
 class Rect;
 class Vector2d;
 
 // Scrolls the given subset of the given canvas by the given offset.
 // The canvas should not have a clip or a transform applied, since platforms
 // may implement those operations differently.
 GFX_EXPORT void ScrollCanvas(SkCanvas* canvas,
                              const Rect& clip,
                              const Vector2d& offset);
 
 }  // namespace gfx
 
 #endif  // UI_GFX_BLIT_H_