Remove RenderViewHost parameter from WebContentsObserver::Did{Start|Stop}Loading.

content/browser/web_contents/web_contents_impl.h

Index: content/browser/web_contents/web_contents_impl.h
diff --git a/content/browser/web_contents/web_contents_impl.h b/content/browser/web_contents/web_contents_impl.h
index 0cd2bdb72c532b4d3cac225a215afcb10993c42b..c9ef571da1af9d3c801741f8c25b0f5a65ad7002 100644
--- a/content/browser/web_contents/web_contents_impl.h
+++ b/content/browser/web_contents/web_contents_impl.h
@@ -659,8 +659,7 @@ class CONTENT_EXPORT WebContentsImpl
   // Changes the IsLoading state and notifies the delegate as needed.
   // |details| is used to provide details on the load that just finished
   // (but can be null if not applicable).
-  void SetIsLoading(RenderViewHost* render_view_host,
-                    bool is_loading,
+  void SetIsLoading(bool is_loading,
                     bool to_different_document,
                     LoadNotificationDetails* details) override;