Remove use of deprecated MessageLoop methods in blimp.

blimp/net/stream_packet_reader.cc

Index: blimp/net/stream_packet_reader.cc
diff --git a/blimp/net/stream_packet_reader.cc b/blimp/net/stream_packet_reader.cc
index 6cd91642f8596cf85e3da1d0a6a94acc42c3cd30..90435ccf1a85cb629d4f2c17ccc436d48e408a7a 100644
--- a/blimp/net/stream_packet_reader.cc
+++ b/blimp/net/stream_packet_reader.cc
@@ -7,10 +7,12 @@
 #include <iostream>
 
 #include "base/callback_helpers.h"
+#include "base/location.h"
 #include "base/logging.h"
 #include "base/memory/weak_ptr.h"
-#include "base/message_loop/message_loop.h"
+#include "base/single_thread_task_runner.h"
 #include "base/sys_byteorder.h"
+#include "base/threading/thread_task_runner_handle.h"
 #include "blimp/net/blimp_connection_statistics.h"
 #include "blimp/net/common.h"
 #include "net/base/io_buffer.h"
@@ -68,7 +70,7 @@ void StreamPacketReader::ReadPacket(
     payload_buffer_ = nullptr;
 
     // Adapt synchronous completion to an asynchronous style.
-    base::MessageLoop::current()->PostTask(
+    base::ThreadTaskRunnerHandle::Get()->PostTask(
         FROM_HERE,
         base::Bind(callback, result == net::OK ? payload_size_ : result));
   } else {