Replace MessageLoop::current()->task_runner() with ThreadTaskRunnerHandle::Get().

ui/views/widget/desktop_aura/x11_whole_screen_move_loop.cc

Index: ui/views/widget/desktop_aura/x11_whole_screen_move_loop.cc
diff --git a/ui/views/widget/desktop_aura/x11_whole_screen_move_loop.cc b/ui/views/widget/desktop_aura/x11_whole_screen_move_loop.cc
index 251dad6259235803d9a2433fd8c004d281ee73d0..1258c61c9cd0a16e6739f9f2834e4eed7e920008 100644
--- a/ui/views/widget/desktop_aura/x11_whole_screen_move_loop.cc
+++ b/ui/views/widget/desktop_aura/x11_whole_screen_move_loop.cc
@@ -10,10 +10,12 @@
 #include <utility>
 
 #include "base/bind.h"
+#include "base/logging.h"
 #include "base/macros.h"
 #include "base/message_loop/message_loop.h"
 #include "base/run_loop.h"
 #include "base/single_thread_task_runner.h"
+#include "base/threading/thread_task_runner_handle.h"
 #include "ui/aura/client/capture_client.h"
 #include "ui/aura/env.h"
 #include "ui/aura/window.h"
@@ -73,6 +75,8 @@ bool X11WholeScreenMoveLoop::CanDispatchEvent(const ui::PlatformEvent& event) {
 }
 
 uint32_t X11WholeScreenMoveLoop::DispatchEvent(const ui::PlatformEvent& event) {
+  DCHECK(base::MessageLoopForUI::IsCurrent());
+
   // This method processes all events while the move loop is active.
   if (!in_move_loop_)
     return ui::POST_DISPATCH_PERFORM_DEFAULT;
@@ -91,7 +95,7 @@ uint32_t X11WholeScreenMoveLoop::DispatchEvent(const ui::PlatformEvent& event) {
         // Post a task to dispatch mouse movement event when control returns to
         // the message loop. This allows smoother dragging since the events are
         // dispatched without waiting for the drag widget updates.
-        base::MessageLoopForUI::current()->task_runner()->PostTask(
+        base::ThreadTaskRunnerHandle::Get()->PostTask(
             FROM_HERE,
             base::Bind(&X11WholeScreenMoveLoop::DispatchMouseMovement,
                        weak_factory_.GetWeakPtr()));