Remove remaining calls to deprecated MessageLoop methods.

remoting/protocol/connection_tester.cc

Index: remoting/protocol/connection_tester.cc
diff --git a/remoting/protocol/connection_tester.cc b/remoting/protocol/connection_tester.cc
index 89389b098c25a0bb7faf040f71ac6183c64846e6..c88be65be6542f62f02e226f284ae84026d0ee76 100644
--- a/remoting/protocol/connection_tester.cc
+++ b/remoting/protocol/connection_tester.cc
@@ -6,6 +6,7 @@
 
 #include "base/bind.h"
 #include "base/message_loop/message_loop.h"
+#include "base/single_thread_task_runner.h"
 #include "net/base/io_buffer.h"
 #include "net/base/net_errors.h"
 #include "remoting/proto/video.pb.h"
@@ -56,7 +57,8 @@ void StreamConnectionTester::CheckResults() {
 
 void StreamConnectionTester::Done() {
   done_ = true;
-  message_loop_->PostTask(FROM_HERE, base::MessageLoop::QuitWhenIdleClosure());
+  message_loop_->task_runner()->PostTask(
+      FROM_HERE, base::MessageLoop::QuitWhenIdleClosure());
 }
 
 void StreamConnectionTester::InitBuffers() {
@@ -174,7 +176,8 @@ void DatagramConnectionTester::CheckResults() {
 
 void DatagramConnectionTester::Done() {
   done_ = true;
-  message_loop_->PostTask(FROM_HERE, base::MessageLoop::QuitWhenIdleClosure());
+  message_loop_->task_runner()->PostTask(
+      FROM_HERE, base::MessageLoop::QuitWhenIdleClosure());
 }
 
 void DatagramConnectionTester::DoWrite() {
@@ -209,7 +212,7 @@ void DatagramConnectionTester::HandleWriteResult(int result) {
   } else if (result > 0) {
     EXPECT_EQ(message_size_, result);
     packets_sent_++;
-    message_loop_->PostDelayedTask(
+    message_loop_->task_runner()->PostDelayedTask(
         FROM_HERE,
         base::Bind(&DatagramConnectionTester::DoWrite, base::Unretained(this)),
         base::TimeDelta::FromMilliseconds(delay_ms_));