Allow Signin page to open other chrome:// URLs if login content in <webview>

extensions/browser/guest_view/test_guest_view_manager.h

Index: extensions/browser/guest_view/test_guest_view_manager.h
diff --git a/extensions/browser/guest_view/test_guest_view_manager.h b/extensions/browser/guest_view/test_guest_view_manager.h
index 283eabba9970f5b9a57360c36c776de65e1bd047..b826f30ff5af9a075c7fc6ec7f334810735b5988 100644
--- a/extensions/browser/guest_view/test_guest_view_manager.h
+++ b/extensions/browser/guest_view/test_guest_view_manager.h
@@ -21,6 +21,8 @@ class TestGuestViewManager : public GuestViewManager {
   void WaitForAllGuestsDeleted();
   content::WebContents* WaitForSingleGuestCreated();
 
+  content::WebContents* GetLastGuestCreated();
+
  private:
   // GuestViewManager override:
   void AddGuest(int guest_instance_id,
@@ -28,7 +30,6 @@ class TestGuestViewManager : public GuestViewManager {
   void RemoveGuest(int guest_instance_id) override;
 
   int GetNumGuests() const;
-  content::WebContents* GetLastGuestCreated();
   void WaitForGuestCreated();
 
   std::vector<linked_ptr<content::WebContentsDestroyedWatcher>>