Revert "content: Remove use of MessageLoopProxy and deprecated MessageLoop APIs"

content/browser/download/download_resource_handler.cc

Index: content/browser/download/download_resource_handler.cc
diff --git a/content/browser/download/download_resource_handler.cc b/content/browser/download/download_resource_handler.cc
index 99a57b197f35c210d682858339e4417dc8fbcdd7..ee610e4bba7faf4b9417b202fe6f8580f2a7a7cf 100644
--- a/content/browser/download/download_resource_handler.cc
+++ b/content/browser/download/download_resource_handler.cc
@@ -7,13 +7,11 @@
 #include <string>
 
 #include "base/bind.h"
-#include "base/location.h"
 #include "base/logging.h"
+#include "base/message_loop/message_loop_proxy.h"
 #include "base/metrics/histogram_macros.h"
 #include "base/metrics/sparse_histogram.h"
-#include "base/single_thread_task_runner.h"
 #include "base/strings/stringprintf.h"
-#include "base/thread_task_runner_handle.h"
 #include "content/browser/byte_stream.h"
 #include "content/browser/download/download_create_info.h"
 #include "content/browser/download/download_interrupt_reasons_impl.h"
@@ -193,7 +191,7 @@ bool DownloadResourceHandler::OnResponseStarted(
   // Create the ByteStream for sending data to the download sink.
   scoped_ptr<ByteStreamReader> stream_reader;
   CreateByteStream(
-      base::ThreadTaskRunnerHandle::Get(),
+      base::MessageLoopProxy::current(),
       BrowserThread::GetMessageLoopProxyForThread(BrowserThread::FILE),
       kDownloadByteStreamSize, &stream_writer_, &stream_reader);
   stream_writer_->RegisterCallback(