Revert 20127

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

Index: tools/dom/templates/html/impl/impl_EventSource.darttemplate
diff --git a/tools/dom/templates/html/impl/impl_EventSource.darttemplate b/tools/dom/templates/html/impl/impl_EventSource.darttemplate
deleted file mode 100644
index c75e292511f7dc2dbe308f4a0c09e7ffc4bbe295..0000000000000000000000000000000000000000
--- a/tools/dom/templates/html/impl/impl_EventSource.darttemplate
+++ /dev/null
@@ -1,15 +0,0 @@
-// Copyright (c) 2013, 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 $LIBRARYNAME;
-
-$(ANNOTATIONS)class $CLASSNAME$EXTENDS$IMPLEMENTS$NATIVESPEC {
-  factory $CLASSNAME(String title, {withCredentials: false}) {
-    var parsedOptions = {
-      'withCredentials': withCredentials,
-    };
-    return $CLASSNAME._factory$CLASSNAME(title, parsedOptions);
-  }
-$!MEMBERS
-}