Canvas2d: Implement rerouting event by hit region's control.

third_party/WebKit/Source/modules/canvas2d/MouseEventHitRegion.h

Index: third_party/WebKit/Source/modules/canvas2d/MouseEventHitRegion.h
diff --git a/third_party/WebKit/Source/modules/canvas2d/MouseEventHitRegion.h b/third_party/WebKit/Source/modules/canvas2d/MouseEventHitRegion.h
deleted file mode 100644
index 2f213164d0a8e345055e3d18038dc017e6528615..0000000000000000000000000000000000000000
--- a/third_party/WebKit/Source/modules/canvas2d/MouseEventHitRegion.h
+++ /dev/null
@@ -1,23 +0,0 @@
-// Copyright 2015 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 MouseEventHitRegion_h
-#define MouseEventHitRegion_h
-
-#include "modules/canvas2d/EventHitRegion.h"
-#include "wtf/Allocator.h"
-
-namespace blink {
-
-class MouseEvent;
-
-class MouseEventHitRegion : public EventHitRegion {
-    STATIC_ONLY(MouseEventHitRegion);
-public:
-    static String region(MouseEvent&);
-};
-
-} // namespace blink
-
-#endif