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

extensions/browser/guest_view/web_view/web_view_guest.cc

Index: extensions/browser/guest_view/web_view/web_view_guest.cc
diff --git a/extensions/browser/guest_view/web_view/web_view_guest.cc b/extensions/browser/guest_view/web_view/web_view_guest.cc
index 52571ececa2be8b20e00e6963bf2d647ad828acc..eb7168dcbbdfb18b5df43d96cd516df3c395d87b 100644
--- a/extensions/browser/guest_view/web_view/web_view_guest.cc
+++ b/extensions/browser/guest_view/web_view/web_view_guest.cc
@@ -315,7 +315,7 @@ void WebViewGuest::AttachWebViewHelpers(WebContents* contents) {
   web_view_permission_helper_.reset(new WebViewPermissionHelper(this));
 }
 
-void WebViewGuest::DidStopLoading() {
+void WebViewGuest::GuestViewDidStopLoading() {
   scoped_ptr<base::DictionaryValue> args(new base::DictionaryValue());
   DispatchEventToView(
       new GuestViewBase::Event(webview::kEventLoadStop, args.Pass()));