Some changes to improve precision of types in dart:html

sdk/lib/html/templates/html/dart2js/impl_CanvasElement.darttemplate

Index: sdk/lib/html/templates/html/dart2js/impl_CanvasElement.darttemplate
diff --git a/sdk/lib/html/templates/html/dart2js/impl_CanvasElement.darttemplate b/sdk/lib/html/templates/html/dart2js/impl_CanvasElement.darttemplate
deleted file mode 100644
index 7d9d2bf641df249a2bae9fbae72e51bd3f115399..0000000000000000000000000000000000000000
--- a/sdk/lib/html/templates/html/dart2js/impl_CanvasElement.darttemplate
+++ /dev/null
@@ -1,9 +0,0 @@
-// Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
-// for details. All rights reserved. Use of this source code is governed by a
-// BSD-style license that can be found in the LICENSE file.
-
-class $CLASSNAME$EXTENDS$IMPLEMENTS$NATIVESPEC {
-$!MEMBERS
-
-  CanvasRenderingContext2D get context2d => getContext('2d');
-}