Convert JsonWriter::Write to taking a const ref for the in-param

google_apis/gaia/fake_gaia.cc

Index: google_apis/gaia/fake_gaia.cc
diff --git a/google_apis/gaia/fake_gaia.cc b/google_apis/gaia/fake_gaia.cc
index bf2331d970abd5c8fcf42bd09cb9f1262ea6ff2d..1bf87ca7fbb5018ed7d9113a807dd26d67604b84 100644
--- a/google_apis/gaia/fake_gaia.cc
+++ b/google_apis/gaia/fake_gaia.cc
@@ -390,7 +390,7 @@ void FakeGaia::HandleProgramaticAuth(
 void FakeGaia::FormatJSONResponse(const base::DictionaryValue& response_dict,
                                   BasicHttpResponse* http_response) {
   std::string response_json;
-  base::JSONWriter::Write(&response_dict, &response_json);
+  base::JSONWriter::Write(response_dict, &response_json);
   http_response->set_content(response_json);
   http_response->set_code(net::HTTP_OK);
 }