Cleanup: Remove forward declarations in ui, part 2.

ui/aura/test/test_windows.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_AURA_TEST_TEST_UTILS_H_
-#define UI_AURA_TEST_TEST_UTILS_H_
+#ifndef UI_AURA_TEST_TEST_WINDOWS_H_
+#define UI_AURA_TEST_TEST_WINDOWS_H_
 #pragma once
 
 #include "base/compiler_specific.h"
 #include "third_party/skia/include/core/SkColor.h"
 #include "ui/aura/test/test_window_delegate.h"
 #include "ui/aura/test/aura_test_base.h"
 
-namespace gfx {
-class Canvas;
-}
-
 namespace aura {
 namespace test {
 
 Window* CreateTestWindowWithId(int id, Window* parent);
 Window* CreateTestWindowWithBounds(const gfx::Rect& bounds, Window* parent);
 Window* CreateTestWindow(SkColor color,
                          int id,
                          const gfx::Rect& bounds,
                          Window* parent);
 Window* CreateTestWindowWithDelegate(WindowDelegate* delegate,
                                      int id,
                                      const gfx::Rect& bounds,
                                      Window* parent);
 
 }  // namespace test
 }  // namespace aura
 
-#endif  // UI_AURA_TEST_TEST_UTILS_H_
+#endif  // UI_AURA_TEST_TEST_WINDOWS_H_