Pass the proper RenderFrameHost to observers.

content/browser/web_contents/web_contents_impl.cc

Index: content/browser/web_contents/web_contents_impl.cc
diff --git a/content/browser/web_contents/web_contents_impl.cc b/content/browser/web_contents/web_contents_impl.cc
index 2095af811f6ffc66b66b550d091621306a6c8870..0b9df23f0673f343f2da19cec1dd7d70d45a5dee 100644
--- a/content/browser/web_contents/web_contents_impl.cc
+++ b/content/browser/web_contents/web_contents_impl.cc
@@ -2810,7 +2810,7 @@ void WebContentsImpl::RenderViewCreated(RenderViewHost* render_view_host) {
   // We tell the observers now instead of when the main RenderFrameHostImpl is
   // constructed because otherwise it would be too early (i.e. IPCs sent to the
   // frame would be dropped because it's not created yet).
-  RenderFrameHost* main_frame = GetMainFrame();
+  RenderFrameHost* main_frame = render_view_host->GetMainFrame();
   FOR_EACH_OBSERVER(
       WebContentsObserver, observers_, RenderFrameCreated(main_frame));
 }