Small changes to get the compilation size of code importing dart:html shorter.

lib/compiler/implementation/lib/js_helper.dart

Index: lib/compiler/implementation/lib/js_helper.dart
===================================================================
--- lib/compiler/implementation/lib/js_helper.dart	(revision 11226)
+++ lib/compiler/implementation/lib/js_helper.dart	(working copy)
@@ -1181,3 +1181,11 @@
  */
 interface JavaScriptIndexingBehavior {
 }
+
+/**
+ * Called by generated code when a method that must be statically
+ * resolved cannot be found.
+ */
+void throwNoSuchMethod(obj, name, arguments) {
+  throw new NoSuchMethodException(obj, name, arguments);
+}