Clean up compositor initialization/destruction.

ui/compositor/compositor_setup.h

-// Copyright (c) 2012 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_COMPOSITOR_COMPOSITOR_SETUP_H_
-#define UI_COMPOSITOR_COMPOSITOR_SETUP_H_
-
-#include "ui/compositor/compositor_export.h"
-
-namespace ui {
-
-// Configures the compositor in such a way that it doesn't render anything.
-// Does nothing on platforms that aren't using the compositor.
-#if !defined(USE_AURA)
-// To centralize the ifdef to this file we define the function as doing nothing
-// on all platforms that don't use a compositor.
-static inline void SetupTestCompositor() {}
-static inline void DisableTestCompositor() {}
-#else
-COMPOSITOR_EXPORT void SetupTestCompositor();
-
-// Disables the test compositor so that the normal compositor is used.
-COMPOSITOR_EXPORT void DisableTestCompositor();
-COMPOSITOR_EXPORT bool IsTestCompositorEnabled();
-#endif
-
-}  // namespace ui
-
-#endif  // UI_COMPOSITOR_COMPOSITOR_SETUP_H_