Revert of Deletes mojo::Callback

content/browser/geolocation/geolocation_service_impl.h

Index: content/browser/geolocation/geolocation_service_impl.h
diff --git a/content/browser/geolocation/geolocation_service_impl.h b/content/browser/geolocation/geolocation_service_impl.h
index 9265db3bd72751102ef8973526a781e7f224d767..df37f8822176ee806044e4f27044c8daabe43b0a 100644
--- a/content/browser/geolocation/geolocation_service_impl.h
+++ b/content/browser/geolocation/geolocation_service_impl.h
@@ -41,9 +41,11 @@
   void ClearOverride();
 
  private:
+  typedef mojo::Callback<void(blink::mojom::GeopositionPtr)> PositionCallback;
+
   // blink::mojom::GeolocationService:
   void SetHighAccuracy(bool high_accuracy) override;
-  void QueryNextPosition(const QueryNextPositionCallback& callback) override;
+  void QueryNextPosition(const PositionCallback& callback) override;
 
   void OnConnectionError();
 
@@ -62,7 +64,7 @@
   base::Closure update_callback_;
 
   // The callback passed to QueryNextPosition.
-  QueryNextPositionCallback position_callback_;
+  PositionCallback position_callback_;
 
   // Valid iff SetOverride() has been called and ClearOverride() has not
   // subsequently been called.