media: Use new wrapper types for media mojo interfaces

media/mojo/services/mojo_provision_fetcher.cc

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "media/mojo/services/mojo_provision_fetcher.h"
 
 #include "base/bind.h"
 
 namespace media {
 
@@ skipping 12 matching lines @@
                                     const ResponseCB& response_cb) {
   DVLOG(1) << __FUNCTION__;
   provision_fetcher_ptr_->Retrieve(
       default_url, request_data,
       base::Bind(&MojoProvisionFetcher::OnResponse, weak_factory_.GetWeakPtr(),
                  response_cb));
 }
 
 void MojoProvisionFetcher::OnResponse(const ResponseCB& response_cb,
                                       bool success,
-                                      mojo::String response) {
+                                      const std::string& response) {
   response_cb.Run(success, response);
 }
 
 }  // namespace media