Gets rid of the LocationArbitrator interface, in preference for LocationProvider.

blimp/engine/feature/geolocation/blimp_location_provider.h

Index: blimp/engine/feature/geolocation/blimp_location_provider.h
diff --git a/blimp/engine/feature/geolocation/blimp_location_provider.h b/blimp/engine/feature/geolocation/blimp_location_provider.h
index d5ffe5ac23ee459b4b1a8a39371a6ed49716b306..cc5ef6e54a9a9236211247c0b62cbb28f59afc73 100644
--- a/blimp/engine/feature/geolocation/blimp_location_provider.h
+++ b/blimp/engine/feature/geolocation/blimp_location_provider.h
@@ -37,13 +37,16 @@ class BlimpLocationProvider : public device::LocationProvider {
   // device::LocationProvider implementation.
   bool StartProvider(bool high_accuracy) override;
   void StopProvider() override;
-  void GetPosition(device::Geoposition* position) override;
-  void RequestRefresh() override;
+  const device::Geoposition& GetPosition() override;
   void OnPermissionGranted() override;
   void SetUpdateCallback(
       const LocationProviderUpdateCallback& callback) override;
 
  private:
+  // Provides a hint to the provider that new location data is needed as soon
+  // as possible.
+  void RequestRefresh();
+
   // This delegate handles a subset of the LocationProvider functionality.
   base::WeakPtr<Delegate> delegate_;