Implement NavigationThrottle::BLOCK_REQUEST_AND_COLLAPSE.

content/browser/loader/navigation_resource_throttle.cc

 // Copyright 2015 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 "content/browser/loader/navigation_resource_throttle.h"
 
 #include <memory>
 
 #include "base/bind.h"
 #include "base/callback.h"
@@ skipping 330 matching lines @@
   DCHECK_NE(NavigationThrottle::DEFER, result);
   if (in_cross_site_transition_) {
     on_transfer_done_result_ = result;
     return;
   }
 
   if (result == NavigationThrottle::CANCEL_AND_IGNORE) {
     CancelAndIgnore();
   } else if (result == NavigationThrottle::CANCEL) {
     Cancel();
-  } else if (result == NavigationThrottle::BLOCK_REQUEST) {
+  } else if (result == NavigationThrottle::BLOCK_REQUEST ||
+             result == NavigationThrottle::BLOCK_REQUEST_AND_COLLAPSE) {
     CancelWithError(net::ERR_BLOCKED_BY_CLIENT);
   } else if (result == NavigationThrottle::BLOCK_RESPONSE) {
     // TODO(mkwst): If we cancel the main frame request with anything other than
     // 'net::ERR_ABORTED', we'll trigger some special behavior that might not be
     // desirable here (non-POSTs will reload the page, while POST has some logic
     // around reloading to avoid duplicating actions server-side). For the
     // moment, only child frame navigations should be blocked. If we need to
     // block main frame navigations in the future, we'll need to carefully
     // consider the right thing to do here.
     DCHECK(!ResourceRequestInfo::ForRequest(request_)->IsMainFrame());
@@ skipping 21 matching lines @@
 
   // If the results of the checks on the UI thread are known, unblock the
   // navigation. Otherwise, wait until the callback has executed.
   if (on_transfer_done_result_ != NavigationThrottle::DEFER) {
     OnUIChecksPerformed(on_transfer_done_result_);
     on_transfer_done_result_ = NavigationThrottle::DEFER;
   }
 }
 
 }  // namespace content