NavigationThrottle: allow customization of net::Error when blocking

chrome/browser/supervised_user/supervised_user_navigation_throttle.cc

 // Copyright 2014 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_navigation_throttle.h"
 
 #include "base/bind.h"
 #include "base/location.h"
 #include "base/logging.h"
 #include "base/memory/ptr_util.h"
@@ skipping 141 matching lines @@
   GURL url = navigation_handle()->GetURL();
   bool got_result = url_filter_->GetFilteringBehaviorForURLWithAsyncChecks(
       url, base::Bind(&SupervisedUserNavigationThrottle::OnCheckDone,
                       weak_ptr_factory_.GetWeakPtr(), url));
   DCHECK_EQ(got_result, behavior_ != SupervisedUserURLFilter::INVALID);
   // If we got a "not blocked" result synchronously, don't defer.
   deferred_ = !got_result || (behavior_ == SupervisedUserURLFilter::BLOCK);
   if (got_result)
     behavior_ = SupervisedUserURLFilter::INVALID;
   if (deferred_)
-    return ThrottleCheckResult::DEFER;
-  return ThrottleCheckResult::PROCEED;
+    return NavigationThrottle::DEFER;
+  return NavigationThrottle::PROCEED;
 }
 
 void SupervisedUserNavigationThrottle::ShowInterstitial(
     const GURL& url,
     supervised_user_error_page::FilteringBehaviorReason reason) {
   // Don't show interstitial synchronously - it doesn't seem like a good idea to
   // show an interstitial right in the middle of a call into a
   // NavigationThrottle. This also lets OnInterstitialResult to be invoked
   // synchronously, once a callback is passed into the
   // SupervisedUserNavigationObserver.
@@ skipping 70 matching lines @@
   DCHECK(deferred_);
   deferred_ = false;
   navigation_handle()->Resume();
 }
 
 void SupervisedUserNavigationThrottle::Cancel() {
   DCHECK(deferred_);
   deferred_ = false;
   navigation_handle()->CancelDeferredNavigation(CANCEL);
 }