Cleanup: Remove unneeded forward declarations from chrome/browser/ui/views.

chrome/browser/ui/views/detachable_toolbar_view.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 CHROME_BROWSER_UI_VIEWS_DETACHABLE_TOOLBAR_VIEW_H_
 #define CHROME_BROWSER_UI_VIEWS_DETACHABLE_TOOLBAR_VIEW_H_
 #pragma once
 
 #include "views/accessible_pane_view.h"
 
-class SkBitmap;
 struct SkRect;
 
 // DetachableToolbarView contains functionality common to views that can detach
 // from the Chrome frame, such as the BookmarkBarView and the Extension shelf.
 class DetachableToolbarView : public views::AccessiblePaneView {
  public:
   // The color gradient start value close to the edge of the divider.
   static const SkColor kEdgeDividerColor;
   // The color gradient value for the middle of the divider.
   static const SkColor kMiddleDividerColor;
@@ skipping 60 matching lines @@
                                    int vertical_padding,
                                    const SkColor& top_color,
                                    const SkColor& middle_color,
                                    const SkColor& bottom_color);
 
  private:
   DISALLOW_COPY_AND_ASSIGN(DetachableToolbarView);
 };
 
 #endif  // CHROME_BROWSER_UI_VIEWS_DETACHABLE_TOOLBAR_VIEW_H_