Fix WebURLLoaderImpl::Context leak if a pending request is canceled.

content/child/resource_dispatcher.h

 // 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.
 
 // See http://dev.chromium.org/developers/design-documents/multi-process-resource-loading
 
 #ifndef CONTENT_CHILD_RESOURCE_DISPATCHER_H_
 #define CONTENT_CHILD_RESOURCE_DISPATCHER_H_
 
 #include <deque>
@@ skipping 95 matching lines @@
     ~PendingRequestInfo();
 
     RequestPeer* peer;
     ResourceType::Type resource_type;
     // The PID of the original process which issued this request. This gets
     // non-zero only for a request proxied by another renderer, particularly
     // requests from plugins.
     int origin_pid;
     MessageQueue deferred_message_queue;
     bool is_deferred;
+    bool is_canceled;
     // Original requested url.
     GURL url;
     // The security origin of the frame that initiates this request.
     GURL frame_origin;
     // The url of the latest response even in case of redirection.
     GURL response_url;
     linked_ptr<IPC::Message> pending_redirect_message;
     base::TimeTicks request_start;
     base::TimeTicks response_start;
     base::TimeTicks completion_time;
@@ skipping 86 matching lines @@
 
   // IO thread timestamp for ongoing IPC message.
   base::TimeTicks io_timestamp_;
 
   DISALLOW_COPY_AND_ASSIGN(ResourceDispatcher);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_CHILD_RESOURCE_DISPATCHER_H_