Moved most of html lib generating scripts into tools.

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

Index: sdk/lib/html/templates/html/dart2js/impl_URL.darttemplate
diff --git a/sdk/lib/html/templates/html/dart2js/impl_URL.darttemplate b/sdk/lib/html/templates/html/dart2js/impl_URL.darttemplate
deleted file mode 100644
index beb55ece69af76e5ddf81ea05c076c278f1e460e..0000000000000000000000000000000000000000
--- a/sdk/lib/html/templates/html/dart2js/impl_URL.darttemplate
+++ /dev/null
@@ -1,19 +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 html;
-
-/// @domName $DOMNAME
-class $CLASSNAME$EXTENDS$IMPLEMENTS$NATIVESPEC {
-
-  static String createObjectUrl(blob_OR_source_OR_stream) =>
-      JS('String',
-         '(window.URL || window.webkitURL).createObjectURL(#)',
-         blob_OR_source_OR_stream);
-
-  static void revokeObjectUrl(String objectUrl) =>
-      JS('void',
-         '(window.URL || window.webkitURL).revokeObjectURL(#)', objectUrl);
-$!MEMBERS
-}