[USS] Show USS counters in about:sync page

ios/chrome/browser/ui/webui/sync_internals/sync_internals_message_handler.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 "ios/chrome/browser/ui/webui/sync_internals/sync_internals_message_handler.h"
 
 #include <vector>
 
 #include "base/logging.h"
 #include "components/browser_sync/profile_sync_service.h"
@@ skipping 167 matching lines @@
 
 void SyncInternalsMessageHandler::OnUpdateCountersUpdated(
     syncer::ModelType type,
     const syncer::UpdateCounters& counters) {
   EmitCounterUpdate(type, sync_driver::sync_ui_util::kUpdate,
                     counters.ToValue());
 }
 
 void SyncInternalsMessageHandler::OnStatusCountersUpdated(
     syncer::ModelType type,
-    const syncer::StatusCounters& counters) {
+    std::unique_ptr<syncer::StatusCounters> counters) {
   EmitCounterUpdate(type, sync_driver::sync_ui_util::kStatus,
-                    counters.ToValue());
+                    counters->ToValue());
 }
 
 void SyncInternalsMessageHandler::EmitCounterUpdate(
     syncer::ModelType type,
     const std::string& counter_type,
     std::unique_ptr<base::DictionaryValue> value) {
   std::unique_ptr<base::DictionaryValue> details(new base::DictionaryValue());
   details->SetString(sync_driver::sync_ui_util::kModelType,
                      ModelTypeToString(type));
   details->SetString(sync_driver::sync_ui_util::kCounterType, counter_type);
@@ skipping 27 matching lines @@
       *value);
 }
 
 // Gets the SyncService of the underlying original profile. May return null.
 sync_driver::SyncService* SyncInternalsMessageHandler::GetSyncService() {
   ios::ChromeBrowserState* browser_state =
       ios::ChromeBrowserState::FromWebUIIOS(web_ui());
   return IOSChromeProfileSyncServiceFactory::GetForBrowserState(
       browser_state->GetOriginalChromeBrowserState());
 }