Cleanup: Remove unneeded forward declarations in views.

views/controls/scrollbar/native_scroll_bar_gtk.h

-// Copyright (c) 2009 The Chromium Authors. All rights reserved.
+// 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 VIEWS_CONTROLS_SCROLLBAR_NATIVE_SCROLL_BAR_GTK_H_
 #define VIEWS_CONTROLS_SCROLLBAR_NATIVE_SCROLL_BAR_GTK_H_
 #pragma once
 
 #include "views/controls/native_control_gtk.h"
 #include "views/controls/scrollbar/native_scroll_bar_wrapper.h"
 
 namespace views {
 
-class ScrollBarContainer;
-
 /////////////////////////////////////////////////////////////////////////////
 //
 // NativeScrollBarGtk
 //
 // A View subclass that wraps a Native gtk scrollbar control.
 //
 // A scrollbar is either horizontal or vertical.
 //
 /////////////////////////////////////////////////////////////////////////////
 class NativeScrollBarGtk : public NativeControlGtk,
@@ skipping 43 matching lines @@
 
   // The NativeScrollBar we are bound to.
   NativeScrollBar* native_scroll_bar_;
 
  private:
   DISALLOW_COPY_AND_ASSIGN(NativeScrollBarGtk);
 };
 
 }  // namespace views
 
-#endif  // #ifndef VIEWS_CONTROLS_SCROLLBAR_NATIVE_SCROLL_BAR_GTK_H_
-
+#endif  // VIEWS_CONTROLS_SCROLLBAR_NATIVE_SCROLL_BAR_GTK_H_