Fixing TransitionEvents after IDL roll.

tools/dom/templates/html/impl/impl_WebKitTransitionEvent.darttemplate

Index: tools/dom/templates/html/impl/impl_WebKitTransitionEvent.darttemplate
diff --git a/tools/dom/templates/html/impl/impl_WebKitTransitionEvent.darttemplate b/tools/dom/templates/html/impl/impl_WebKitTransitionEvent.darttemplate
deleted file mode 100644
index 511cebf7cf0c4d268d4ac75975ce5261ddf6a374..0000000000000000000000000000000000000000
--- a/tools/dom/templates/html/impl/impl_WebKitTransitionEvent.darttemplate
+++ /dev/null
@@ -1,10 +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.
-
-part of $LIBRARYNAME;
-
-// This class maps WebKitTransitionEvent to TransitionEvent for older Chrome
-// browser versions.
-$(ANNOTATIONS)class $CLASSNAME$EXTENDS implements TransitionEvent $NATIVESPEC {
-$!MEMBERS}