Add a null pointer check for transaction_ in...

net/url_request/url_request_http_job.cc

 // Copyright (c) 2006-2008 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_http_job.h"
 
 #include "base/base_switches.h"
 #include "base/command_line.h"
 #include "base/compiler_specific.h"
 #include "base/file_util.h"
@@ skipping 311 matching lines @@
   // which will cause the consumer to receive OnResponseStarted instead of
   // OnAuthRequired.
   //
   // We have to do this via InvokeLater to avoid "recursing" the consumer.
   //
   MessageLoop::current()->PostTask(FROM_HERE, NewRunnableMethod(
       this, &URLRequestHttpJob::OnStartCompleted, net::OK));
 }
 
 void URLRequestHttpJob::ContinueDespiteLastError() {
-  DCHECK(transaction_.get());
+  // If the transaction was destroyed, then the job was cancelled.
+  if (!transaction_.get())
+    return;
+
   DCHECK(!response_info_) << "should not have a response yet";
 
   // No matter what, we want to report our status as IO pending since we will
   // be notifying our consumer asynchronously via OnStartCompleted.
   SetStatus(URLRequestStatus(URLRequestStatus::IO_PENDING, 0));
 
   int rv = transaction_->RestartIgnoringLastError(&start_callback_);
   if (rv == net::ERR_IO_PENDING)
     return;
 
@@ skipping 206 matching lines @@
   DCHECK(response_cookies_.empty());
 
   std::string name = "Set-Cookie";
   std::string value;
 
   void* iter = NULL;
   while (response_info_->headers->EnumerateHeader(&iter, name, &value))
     response_cookies_.push_back(value);
 }