Extend the ToRenderFrameHost magic to FrameTreeNode* and Shell*

content/browser/web_contents/opened_by_dom_browsertest.cc

Index: content/browser/web_contents/opened_by_dom_browsertest.cc
diff --git a/content/browser/web_contents/opened_by_dom_browsertest.cc b/content/browser/web_contents/opened_by_dom_browsertest.cc
index 44a184c20390e0147b41be2368e2e9cd19cd343f..699121da96fa3502a995b1a1f583153db0fdf2ab 100644
--- a/content/browser/web_contents/opened_by_dom_browsertest.cc
+++ b/content/browser/web_contents/opened_by_dom_browsertest.cc
@@ -73,8 +73,7 @@ class OpenedByDOMTest : public ContentBrowserTest {
     TestNavigationObserver nav_observer(NULL);
     nav_observer.StartWatchingNewWebContents();
     CHECK(ExecuteScript(
-        shell->web_contents(),
-        base::StringPrintf("window.open('%s')", url.spec().c_str())));
+        shell, base::StringPrintf("window.open('%s')", url.spec().c_str())));
     nav_observer.Wait();
     return new_shell_observer.GetShell();
   }