Allow URLRequests from one context to have different NetworkDelegates.

net/url_request/url_request_throttler_entry.cc

 // Copyright (c) 2012 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 "net/url_request/url_request_throttler_entry.h"
 
 #include <cmath>
 
 #include "base/logging.h"
 #include "base/metrics/field_trial.h"
@@ skipping 132 matching lines @@
 
 void URLRequestThrottlerEntry::DisableBackoffThrottling() {
   is_backoff_disabled_ = true;
 }
 
 void URLRequestThrottlerEntry::DetachManager() {
   manager_ = NULL;
 }
 
 bool URLRequestThrottlerEntry::ShouldRejectRequest(
-    const URLRequest& request) const {
+    const URLRequest& request,
+    NetworkDelegate* network_delegate) const {
   bool reject_request = false;
   if (!is_backoff_disabled_ && !ExplicitUserRequest(request.load_flags()) &&
-      (!request.context()->network_delegate() ||
-       request.context()->network_delegate()->CanThrottleRequest(request)) &&
+      (!network_delegate || network_delegate->CanThrottleRequest(request)) &&
       GetBackoffEntry()->ShouldRejectRequest()) {
     int num_failures = GetBackoffEntry()->failure_count();
     int release_after_ms =
         GetBackoffEntry()->GetTimeUntilRelease().InMilliseconds();
 
     net_log_.AddEvent(
         NetLog::TYPE_THROTTLING_REJECTED_REQUEST,
         base::Bind(&NetLogRejectedRequestCallback,
                    &url_id_, num_failures, release_after_ms));
 
@@ skipping 144 matching lines @@
 BackoffEntry* URLRequestThrottlerEntry::GetBackoffEntry() {
   return &backoff_entry_;
 }
 
 // static
 bool URLRequestThrottlerEntry::ExplicitUserRequest(const int load_flags) {
   return (load_flags & LOAD_MAYBE_USER_GESTURE) != 0;
 }
 
 }  // namespace net