Allow cert-popup for WebView guests.

chrome/browser/ui/cocoa/constrained_window/constrained_window_mac.h

Index: chrome/browser/ui/cocoa/constrained_window/constrained_window_mac.h
diff --git a/chrome/browser/ui/cocoa/constrained_window/constrained_window_mac.h b/chrome/browser/ui/cocoa/constrained_window/constrained_window_mac.h
index e3d981edd473d5ba63b33dffd050956c2b3e3fe3..c32a544636f06f5ce34bc98986d9beb440ed10cf 100644
--- a/chrome/browser/ui/cocoa/constrained_window/constrained_window_mac.h
+++ b/chrome/browser/ui/cocoa/constrained_window/constrained_window_mac.h
@@ -31,6 +31,11 @@ class ConstrainedWindowMac {
                        id<ConstrainedWindowSheet> sheet);
   ~ConstrainedWindowMac();
 
+  // Indicates if the dialog can be successfully shown.
+  // TODO(davidben): Remove this when the certificate selector prompt is moved
+  // to the WebContentsDelegate. https://crbug.com/456255.
+  static bool HasTopLevelDialogManager(content::WebContents* web_contents);
+
   // Closes the constrained window.
   void CloseWebContentsModalDialog();