Remove MessageLoop::current()->task_runner() in ui.

ui/accelerated_widget_mac/display_link_mac.cc

Index: ui/accelerated_widget_mac/display_link_mac.cc
diff --git a/ui/accelerated_widget_mac/display_link_mac.cc b/ui/accelerated_widget_mac/display_link_mac.cc
index 72470f64b1ed0c35045310ceb4097952667392e4..a6bf7f120e9711adb3cc3b95fdbda1b4917693dc 100644
--- a/ui/accelerated_widget_mac/display_link_mac.cc
+++ b/ui/accelerated_widget_mac/display_link_mac.cc
@@ -6,8 +6,10 @@
 
 #include <stdint.h>
 
+#include "base/location.h"
 #include "base/logging.h"
-#include "base/message_loop/message_loop.h"
+#include "base/single_thread_task_runner.h"
+#include "base/threading/thread_task_runner_handle.h"
 #include "base/trace_event/trace_event.h"
 
 namespace base {
@@ -81,11 +83,10 @@ scoped_refptr<DisplayLinkMac> DisplayLinkMac::GetForDisplay(
 DisplayLinkMac::DisplayLinkMac(
     CGDirectDisplayID display_id,
     base::ScopedTypeRef<CVDisplayLinkRef> display_link)
-      : main_thread_task_runner_(
-            base::MessageLoop::current()->task_runner()),
-        display_id_(display_id),
-        display_link_(display_link),
-        timebase_and_interval_valid_(false) {
+    : main_thread_task_runner_(base::ThreadTaskRunnerHandle::Get()),
+      display_id_(display_id),
+      display_link_(display_link),
+      timebase_and_interval_valid_(false) {
   DCHECK(display_map_.Get().find(display_id) == display_map_.Get().end());
   if (display_map_.Get().empty()) {
     CGError register_error = CGDisplayRegisterReconfigurationCallback(