fix return out of handlescope in NestedLockers

R=jkummerow@chromium.org
BUG=

Review URL: https://codereview.chromium.org/16076004

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@14869 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

test/cctest/test-api.cc

@@ -12056,7 +12056,7 @@ static v8::Handle<Value> ThrowInJSNoCatch(const v8::Arguments& args) {
     v8::HandleScope scope(args.GetIsolate());
     v8::Handle<Value> value = CompileRun(code);
     CHECK(value.IsEmpty());
-    return v8_str("foo");
+    return scope.Close(v8_str("foo"));
   }
 }