Remove obsolete String + code

runtime/lib/string.cc

Index: runtime/lib/string.cc
===================================================================
--- runtime/lib/string.cc	(revision 8799)
+++ runtime/lib/string.cc	(working copy)
@@ -117,27 +117,6 @@
 }
 
 
-// TODO(hausner): Remove obsolete String_plus.
-DECLARE_FLAG(bool, allow_string_plus);
-DEFINE_NATIVE_ENTRY(String_plus, 2) {
-  const String& receiver = String::CheckedHandle(arguments->At(0));
-  GET_NATIVE_ARGUMENT(String, b, arguments->At(1));
-  if (!FLAG_allow_string_plus) {
-    // Throw a noSuchMethod exception if operator + is not supported.
-    const String& func_name = String::Handle(String::New("+"));
-    const Array& func_args = Array::Handle(Array::New(1));
-    func_args.SetAt(0, b);
-    GrowableArray<const Object*> dart_arguments(3);
-    dart_arguments.Add(&receiver);
-    dart_arguments.Add(&func_name);
-    dart_arguments.Add(&func_args);
-    Exceptions::ThrowByType(Exceptions::kNoSuchMethod, dart_arguments);
-  }
-  const String& result = String::Handle(String::Concat(receiver, b));
-  arguments->SetReturn(result);
-}
-
-
 DEFINE_NATIVE_ENTRY(String_toLowerCase, 1) {
   const String& receiver = String::CheckedHandle(arguments->At(0));
   ASSERT(!receiver.IsNull());