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

chrome/browser/ui/tab_contents/core_tab_helper.h

Index: chrome/browser/ui/tab_contents/core_tab_helper.h
diff --git a/chrome/browser/ui/tab_contents/core_tab_helper.h b/chrome/browser/ui/tab_contents/core_tab_helper.h
index 069edb276d254d9750ecbd76d9c43c38ef0b949b..c127aa7bc5a3218079b4ab2152c71ff37927877c 100644
--- a/chrome/browser/ui/tab_contents/core_tab_helper.h
+++ b/chrome/browser/ui/tab_contents/core_tab_helper.h
@@ -59,7 +59,7 @@ class CoreTabHelper : public content::WebContentsObserver,
                                           content::WebContents* source);
 
   // content::WebContentsObserver overrides:
-  void DidStartLoading(content::RenderViewHost* render_view_host) override;
+  void DidStartLoading() override;
   void WasShown() override;
   void WebContentsDestroyed() override;
   void BeforeUnloadFired(const base::TimeTicks& proceed_time) override;