Extend the ToRenderFrameHost magic to FrameTreeNode* and Shell*

content/public/test/content_browser_test_utils.h

Index: content/public/test/content_browser_test_utils.h
diff --git a/content/public/test/content_browser_test_utils.h b/content/public/test/content_browser_test_utils.h
index 2258569b5035b3625735afd1f7a8cef1272f808b..e198b1ed4f74b64c7951f099942f55304a68dcbf 100644
--- a/content/public/test/content_browser_test_utils.h
+++ b/content/public/test/content_browser_test_utils.h
@@ -29,6 +29,7 @@ class Rect;
 namespace content {
 
 class MessageLoopRunner;
+class RenderFrameHost;
 class Shell;
 class WebContents;
 
@@ -80,6 +81,9 @@ void ReloadBypassingCacheBlockUntilNavigationsComplete(
 // Wait until an application modal dialog is requested.
 void WaitForAppModalDialog(Shell* window);
 
+// Extends the ToRenderFrameHost mechanism to content::Shells.
+RenderFrameHost* ConvertToRenderFrameHost(Shell* shell);
+
 // Used to wait for a new Shell window to be created. Instantiate this object
 // before the operation that will create the window.
 class ShellAddedObserver {