[USS] Show USS counters in about:sync page

components/sync/driver/fake_sync_service.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 "components/sync/driver/fake_sync_service.h"
 
 #include "base/memory/ptr_util.h"
 #include "base/values.h"
 #include "components/sync/core/base_transaction.h"
 #include "components/sync/core/user_share.h"
@@ skipping 159 matching lines @@
 }
 
 std::string FakeSyncService::GetBackendInitializationStateString() const {
   return std::string();
 }
 
 syncer::SyncCycleSnapshot FakeSyncService::GetLastCycleSnapshot() const {
   return syncer::SyncCycleSnapshot();
 }
 
-base::Value* FakeSyncService::GetTypeStatusMap() const {
+base::Value* FakeSyncService::GetTypeStatusMap() {
   return new base::ListValue();
 }
 
 const GURL& FakeSyncService::sync_service_url() const {
   return sync_service_url_;
 }
 
 std::string FakeSyncService::unrecoverable_error_message() const {
   return unrecoverable_error_message_;
 }
@@ skipping 16 matching lines @@
     syncer::TypeDebugInfoObserver* observer) {}
 
 base::WeakPtr<syncer::JsController> FakeSyncService::GetJsController() {
   return base::WeakPtr<syncer::JsController>();
 }
 
 void FakeSyncService::GetAllNodes(
     const base::Callback<void(std::unique_ptr<base::ListValue>)>& callback) {}
 
 }  // namespace sync_driver