Cleanup: IWYU for base/gtest_prod_util.h.

ash/display/unified_mouse_warp_controller.h

Index: ash/display/unified_mouse_warp_controller.h
diff --git a/ash/display/unified_mouse_warp_controller.h b/ash/display/unified_mouse_warp_controller.h
index 95fdbf69fe482c2aae8bbb84f545b5ae3825fb2d..298ae9aaa5743133510d3ab72320b89b449912e6 100644
--- a/ash/display/unified_mouse_warp_controller.h
+++ b/ash/display/unified_mouse_warp_controller.h
@@ -2,12 +2,11 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#ifndef ASH_DISPLAY_UNIFIED_MOUSE_WARP_CONTROLLER_H
-#define ASH_DISPLAY_UNIFIED_MOUSE_WARP_CONTROLLER_H
+#ifndef ASH_DISPLAY_UNIFIED_MOUSE_WARP_CONTROLLER_H_
+#define ASH_DISPLAY_UNIFIED_MOUSE_WARP_CONTROLLER_H_
 
 #include "ash/display/mouse_warp_controller.h"
 
-#include "base/gtest_prod_util.h"
 #include "ui/gfx/geometry/rect.h"
 
 namespace aura {
@@ -62,4 +61,4 @@ class ASH_EXPORT UnifiedMouseWarpController : public MouseWarpController {
 
 }  // namespace ash
 
-#endif  // ASH_DISPLAY_UNIFIED_MOUSE_WARP_CONTROLLER_H
+#endif  // ASH_DISPLAY_UNIFIED_MOUSE_WARP_CONTROLLER_H_