Account for NULL headers in streams.

content/browser/loader/resource_dispatcher_host_impl.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.
 
 // See http://dev.chromium.org/developers/design-documents/multi-process-resource-loading
 
 #include "content/browser/loader/resource_dispatcher_host_impl.h"
 
 #include <algorithm>
 #include <set>
@@ skipping 727 matching lines @@
                                 origin));
 
   info->set_is_stream(true);
   scoped_ptr<StreamInfo> stream_info(new StreamInfo);
   stream_info->handle = handler->stream()->CreateHandle();
   stream_info->original_url = request->url();
   stream_info->mime_type = mime_type;
   // Make a copy of the response headers so it is safe to pass across threads;
   // the old handler (AsyncResourceHandler) may modify it in parallel via the
   // ResourceDispatcherHostDelegate.
-  stream_info->response_headers =
-      new net::HttpResponseHeaders(response->head.headers->raw_headers());
+  if (response->head.headers.get()) {
+    stream_info->response_headers =
+        new net::HttpResponseHeaders(response->head.headers->raw_headers());
+  }
   delegate_->OnStreamCreated(request, stream_info.Pass());
   return handler.PassAs<ResourceHandler>();
 }
 
 ResourceDispatcherHostLoginDelegate*
 ResourceDispatcherHostImpl::CreateLoginDelegate(
     ResourceLoader* loader,
     net::AuthChallengeInfo* auth_info) {
   if (!delegate_)
     return NULL;
@@ skipping 1396 matching lines @@
 
   // Add a flag to selectively bypass the data reduction proxy if the resource
   // type is not an image.
   if (request_data.resource_type != RESOURCE_TYPE_IMAGE)
     load_flags |= net::LOAD_BYPASS_DATA_REDUCTION_PROXY;
 
   return load_flags;
 }
 
 }  // namespace content