Makes use of EngineGeolocationFeature weak_ptr threadsafe.

blimp/engine/feature/geolocation/mock_blimp_location_provider_delegate.h

Index: blimp/engine/feature/geolocation/mock_blimp_location_provider_delegate.h
diff --git a/blimp/engine/feature/geolocation/mock_blimp_location_provider_delegate.h b/blimp/engine/feature/geolocation/mock_blimp_location_provider_delegate.h
index 6b5762de1ebe56c1d8f65093171f80a82e0344ae..7308979a112875d7850dda400d7f2fb52a81ffde 100644
--- a/blimp/engine/feature/geolocation/mock_blimp_location_provider_delegate.h
+++ b/blimp/engine/feature/geolocation/mock_blimp_location_provider_delegate.h
@@ -24,9 +24,8 @@ class MockBlimpLocationProviderDelegate
   MOCK_METHOD1(RequestAccuracy,
                void(GeolocationSetInterestLevelMessage::Level level));
   MOCK_METHOD0(OnPermissionGranted, void());
-  MOCK_METHOD1(
-      SetUpdateCallback,
-      void(const base::Callback<void(const device::Geoposition&)>& callback));
+  MOCK_METHOD1(SetUpdateCallback,
+               void(const GeopositionReceivedCallback& callback));
 
  private:
   base::WeakPtrFactory<MockBlimpLocationProviderDelegate> weak_factory_;