sync: Implement disabling of non blocking types

sync/internal_api/sync_core_proxy_impl_unittest.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 "base/message_loop/message_loop.h"
 #include "base/message_loop/message_loop_proxy.h"
 #include "base/run_loop.h"
 #include "base/sequenced_task_runner.h"
 #include "sync/internal_api/public/base/model_type.h"
 #include "sync/internal_api/public/non_blocking_type_processor.h"
@@ skipping 13 matching lines @@
         core_proxy_(
             sync_task_runner_,
             core_->AsWeakPtr()) {}
 
   // The sync thread could be shut down at any time without warning.  This
   // function simulates such an event.
   void DisableSync() {
     core_.reset();
   }
 
-  SyncCoreProxy* GetProxy() {
-    return &core_proxy_;
-  }
+  scoped_ptr<SyncCoreProxy> GetProxy() { return core_proxy_.Clone(); }
 
  private:
   base::MessageLoop loop_;
   scoped_refptr<base::SequencedTaskRunner> sync_task_runner_;
   scoped_refptr<base::SequencedTaskRunner> type_task_runner_;
   ModelTypeRegistry registry_;
   scoped_ptr<SyncCore> core_;
   SyncCoreProxyImpl core_proxy_;
 };
 
@@ skipping 39 matching lines @@
   themes_processor->Enable(GetProxy());
 
   base::RunLoop run_loop_;
   run_loop_.RunUntilIdle();
 
   EXPECT_TRUE(themes_processor->IsConnected());
   DisableSync();
 }
 
 }  // namespace syncer