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

third_party/WebKit/Source/modules/canvas2d/TouchHitRegion.idl

Index: third_party/WebKit/Source/modules/canvas2d/TouchHitRegion.idl
diff --git a/third_party/WebKit/Source/modules/canvas2d/TouchHitRegion.idl b/third_party/WebKit/Source/modules/canvas2d/TouchHitRegion.idl
deleted file mode 100644
index 50c6a92d3eed7cd3f6653f51af40bb8c6457a0e5..0000000000000000000000000000000000000000
--- a/third_party/WebKit/Source/modules/canvas2d/TouchHitRegion.idl
+++ /dev/null
@@ -1,11 +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.
-
-// https://html.spec.whatwg.org/multipage/scripting.html#Touch-partial
-
-[
-    RuntimeEnabled=ExperimentalCanvasFeatures
-] partial interface Touch {
-    readonly attribute DOMString? region;
-};