Allow cert-popup for WebView guests.

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

Index: chrome/browser/ui/cocoa/constrained_window/constrained_window_mac.mm
diff --git a/chrome/browser/ui/cocoa/constrained_window/constrained_window_mac.mm b/chrome/browser/ui/cocoa/constrained_window/constrained_window_mac.mm
index f043fad5a0c019634695a187d725aec839d59d58..8ffb441862cf31512322ae0e08251f904b2e85cb 100644
--- a/chrome/browser/ui/cocoa/constrained_window/constrained_window_mac.mm
+++ b/chrome/browser/ui/cocoa/constrained_window/constrained_window_mac.mm
@@ -32,6 +32,16 @@ ConstrainedWindowMac::ConstrainedWindowMac(
   manager->ShowDialogWithManager([sheet sheetWindow], native_manager.Pass());
 }
 
+bool ConstrainedWindowMac::HasTopLevelDialogManager(
+    content::WebContents* web_contents) {
+  // |web_contents| may be embedded within a chain of nested GuestViews. If it
+  // is, follow the chain of embedders to the outermost WebContents and use it.
+  web_contents =
+      guest_view::GuestViewBase::GetTopLevelWebContents(web_contents);
+
+  return WebContentsModalDialogManager::FromWebContents(web_contents) != NULL;
+}
+
 ConstrainedWindowMac::~ConstrainedWindowMac() {
   CHECK(content::BrowserThread::CurrentlyOn(content::BrowserThread::UI));
   DCHECK(!manager_);