Geolocation: extract ContentBrowserClient methods specific to Geolocation into a class

content/browser/geolocation/geolocation_provider_impl.h

Index: content/browser/geolocation/geolocation_provider_impl.h
diff --git a/content/browser/geolocation/geolocation_provider_impl.h b/content/browser/geolocation/geolocation_provider_impl.h
index b7c7e9dcbc9ed7681dad836f2f831a8500e88475..7b212ce9c0e6974e08ccccc7825b8715e4d94728 100644
--- a/content/browser/geolocation/geolocation_provider_impl.h
+++ b/content/browser/geolocation/geolocation_provider_impl.h
@@ -91,6 +91,9 @@ class CONTENT_EXPORT GeolocationProviderImpl
   // True only in testing, where we want to use a custom position.
   bool ignore_location_updates_;
 
+  // The system provided Delegate for the |arbitrator_|.
+  std::unique_ptr<GeolocationProvider::Delegate> delegate_;
+
   // Only to be used on the geolocation thread.
   std::unique_ptr<LocationArbitrator> arbitrator_;