Mojo C++ bindings: switch WebKit mojom targets to use STL/WTF types.

content/renderer/background_sync/background_sync_client_impl.cc

 // Copyright 2015 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 "content/renderer/background_sync/background_sync_client_impl.h"
 
 #include <utility>
 
 #include "base/time/time.h"
 #include "content/child/background_sync/background_sync_type_converters.h"
@@ skipping 10 matching lines @@
     mojo::InterfaceRequest<blink::mojom::BackgroundSyncServiceClient> request) {
   mojo::MakeStrongBinding(base::WrapUnique(new BackgroundSyncClientImpl),
                           std::move(request));
 }
 
 BackgroundSyncClientImpl::~BackgroundSyncClientImpl() {}
 
 BackgroundSyncClientImpl::BackgroundSyncClientImpl() {}
 
 void BackgroundSyncClientImpl::Sync(
-    const mojo::String& tag,
+    const std::string& tag,
     blink::mojom::BackgroundSyncEventLastChance last_chance,
     const SyncCallback& callback) {
   DCHECK(!blink::Platform::current()->mainThread()->isCurrentThread());
 
   ServiceWorkerContextClient* client =
       ServiceWorkerContextClient::ThreadSpecificInstance();
   if (!client) {
     callback.Run(blink::mojom::ServiceWorkerEventStatus::ABORTED,
                  base::Time::Now());
     return;
   }
 
   blink::WebServiceWorkerContextProxy::LastChanceOption web_last_chance =
       mojo::ConvertTo<blink::WebServiceWorkerContextProxy::LastChanceOption>(
           last_chance);
 
   client->DispatchSyncEvent(tag, web_last_chance, callback);
 }
 
 }  // namespace content