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

content/browser/android/web_contents_observer_proxy.h

Index: content/browser/android/web_contents_observer_proxy.h
diff --git a/content/browser/android/web_contents_observer_proxy.h b/content/browser/android/web_contents_observer_proxy.h
index 1d45011d34491fa20fcae6ecaa2a9fcdd40c3929..7ee1a22efbbad311fe39477ce932538b771d2358 100644
--- a/content/browser/android/web_contents_observer_proxy.h
+++ b/content/browser/android/web_contents_observer_proxy.h
@@ -32,8 +32,8 @@ class WebContentsObserverProxy : public WebContentsObserver {
  private:
   void RenderViewReady() override;
   void RenderProcessGone(base::TerminationStatus termination_status) override;
-  void DidStartLoading(RenderViewHost* render_view_host) override;
-  void DidStopLoading(RenderViewHost* render_view_host) override;
+  void DidStartLoading() override;
+  void DidStopLoading() override;
   void DidFailProvisionalLoad(RenderFrameHost* render_frame_host,
                               const GURL& validated_url,
                               int error_code,