Extend the ToRenderFrameHost magic to FrameTreeNode* and Shell*

content/public/test/content_browser_test_utils.cc

Index: content/public/test/content_browser_test_utils.cc
diff --git a/content/public/test/content_browser_test_utils.cc b/content/public/test/content_browser_test_utils.cc
index 6be71c424d0fda55353a21460e99f72ef0469866..b77a2724d31722b87715645e4307b8cb69094134 100644
--- a/content/public/test/content_browser_test_utils.cc
+++ b/content/public/test/content_browser_test_utils.cc
@@ -104,6 +104,10 @@ void WaitForAppModalDialog(Shell* window) {
   runner->Run();
 }
 
+RenderFrameHost* ConvertToRenderFrameHost(Shell* shell) {
+  return shell->web_contents()->GetMainFrame();
+}
+
 ShellAddedObserver::ShellAddedObserver()
     : shell_(NULL) {
   Shell::SetShellCreatedCallback(