[Sync] Componentize local_device_info_provider_impl and test

components/sync_driver/local_device_info_provider_mock.h

Index: components/sync_driver/local_device_info_provider_mock.h
diff --git a/components/sync_driver/local_device_info_provider_mock.h b/components/sync_driver/local_device_info_provider_mock.h
index 5cea16309d8ac17cb79164a2741b5fd1319d6013..0f22370346e2a8362074a51a9390d3f2a75141db 100644
--- a/components/sync_driver/local_device_info_provider_mock.h
+++ b/components/sync_driver/local_device_info_provider_mock.h
@@ -28,8 +28,10 @@ class LocalDeviceInfoProviderMock
   const DeviceInfo* GetLocalDeviceInfo() const override;
   std::string GetSyncUserAgent() const override;
   std::string GetLocalSyncCacheGUID() const override;
-  void Initialize(const std::string& cache_guid,
-                  const std::string& signin_scoped_device_id) override;
+  void Initialize(
+      const std::string& cache_guid,
+      const std::string& signin_scoped_device_id,
+      const scoped_refptr<base::TaskRunner>& blocking_task_runner) override;
   scoped_ptr<Subscription> RegisterOnInitializedCallback(
       const base::Closure& callback) override;