Remove calls to deprecated MessageLoop methods in chrome.

chrome/common/mac/mock_launchd.cc

Index: chrome/common/mac/mock_launchd.cc
diff --git a/chrome/common/mac/mock_launchd.cc b/chrome/common/mac/mock_launchd.cc
index 786654123cd384dd9abe477a5631f203ca16bcc3..1f1233130f6588e29925314846b84424a05cecb5 100644
--- a/chrome/common/mac/mock_launchd.cc
+++ b/chrome/common/mac/mock_launchd.cc
@@ -18,6 +18,7 @@
 #include "base/mac/scoped_cftyperef.h"
 #include "base/macros.h"
 #include "base/message_loop/message_loop.h"
+#include "base/single_thread_task_runner.h"
 #include "base/strings/string_util.h"
 #include "base/strings/stringprintf.h"
 #include "base/strings/sys_string_conversions.h"
@@ -226,7 +227,8 @@ CFDictionaryRef MockLaunchd::CopyDictionaryByCheckingIn(CFErrorRef* error) {
 
 bool MockLaunchd::RemoveJob(CFStringRef label, CFErrorRef* error) {
   remove_called_ = true;
-  message_loop_->PostTask(FROM_HERE, base::MessageLoop::QuitWhenIdleClosure());
+  message_loop_->task_runner()->PostTask(
+      FROM_HERE, base::MessageLoop::QuitWhenIdleClosure());
   return true;
 }
 
@@ -235,7 +237,8 @@ bool MockLaunchd::RestartJob(Domain domain,
                              CFStringRef name,
                              CFStringRef session_type) {
   restart_called_ = true;
-  message_loop_->PostTask(FROM_HERE, base::MessageLoop::QuitWhenIdleClosure());
+  message_loop_->task_runner()->PostTask(
+      FROM_HERE, base::MessageLoop::QuitWhenIdleClosure());
   return true;
 }