Switch to using URLRequestContextBuilder to create some URLRequestContexts.

mojo/services/network/url_loader_impl.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 "mojo/services/network/url_loader_impl.h"
 
+#include "base/message_loop/message_loop.h"
 #include "mojo/common/common_type_converters.h"
 #include "mojo/services/network/network_context.h"
 #include "net/base/io_buffer.h"
 #include "net/base/load_flags.h"
 #include "net/http/http_response_headers.h"
 
 namespace mojo {
 namespace {
 
 const uint32_t kMaxReadSize = 64 * 1024;
@@ skipping 227 matching lines @@
   if (completed_synchronously) {
     base::MessageLoop::current()->PostTask(
         FROM_HERE,
         base::Bind(&URLLoaderImpl::ReadMore, weak_ptr_factory_.GetWeakPtr()));
   } else {
     ReadMore();
   }
 }
 
 }  // namespace mojo