Remove unused render_view_ field from GeolocationDispatcher class.

chrome/renderer/geolocation_dispatcher.h

Index: chrome/renderer/geolocation_dispatcher.h
diff --git a/chrome/renderer/geolocation_dispatcher.h b/chrome/renderer/geolocation_dispatcher.h
index b7809a0035b873b28a95772b0c15c14871a569d4..fb62cf39746398126cb450deba873f13f627999d 100644
--- a/chrome/renderer/geolocation_dispatcher.h
+++ b/chrome/renderer/geolocation_dispatcher.h
@@ -52,9 +52,6 @@ class GeolocationDispatcher : public RenderViewObserver,
   // We have an updated geolocation position or error code.
   void OnGeolocationPositionUpdated(const Geoposition& geoposition);
 
-  // GeolocationDispatcher is owned by RenderView. Back pointer for IPC.
-  RenderView* render_view_;
-
   // The controller_ is valid for the lifetime of the underlying
   // WebCore::GeolocationController. geolocationDestroyed() is
   // invoked when the underlying object is destroyed.