Implement NavigationThrottle::BLOCK_REQUEST_AND_COLLAPSE.

chrome/browser/supervised_user/supervised_user_google_auth_navigation_throttle.cc

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "chrome/browser/supervised_user/supervised_user_google_auth_navigation_throttle.h"
 
 #include "base/memory/ptr_util.h"
 #include "chrome/browser/profiles/profile.h"
 #include "chrome/browser/signin/signin_manager_factory.h"
 #include "chrome/browser/supervised_user/child_accounts/child_account_service.h"
@@ skipping 84 matching lines @@
     case content::NavigationThrottle::CANCEL:
     case content::NavigationThrottle::CANCEL_AND_IGNORE: {
       navigation_handle()->CancelDeferredNavigation(result);
       break;
     }
     case content::NavigationThrottle::DEFER: {
       // Keep blocking.
       break;
     }
     case content::NavigationThrottle::BLOCK_REQUEST:
+    case content::NavigationThrottle::BLOCK_REQUEST_AND_COLLAPSE:
     case content::NavigationThrottle::BLOCK_RESPONSE: {
       NOTREACHED();
     }
   }
 }
 
 content::NavigationThrottle::ThrottleCheckResult
 SupervisedUserGoogleAuthNavigationThrottle::ShouldProceed(bool authenticated) {
   if (authenticated)
     return content::NavigationThrottle::PROCEED;
@@ skipping 26 matching lines @@
   if (reauth_successful) {
     // If reauthentication was not successful, wait until the cookies are
     // refreshed, which will call us back separately.
     return;
   }
 
   // Otherwise cancel immediately.
   navigation_handle()->CancelDeferredNavigation(
       content::NavigationThrottle::CANCEL_AND_IGNORE);
 }