ash: Do not use MessageLoopForUI when not needed.

ash/shelf/shelf_tooltip_manager.cc

 // Copyright 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "ash/shelf/shelf_tooltip_manager.h"
 
 #include "ash/shelf/shelf_layout_manager.h"
 #include "ash/shelf/shelf_view.h"
 #include "ash/shell.h"
 #include "ash/shell_window_ids.h"
 #include "ash/wm/window_animations.h"
 #include "base/bind.h"
-#include "base/message_loop/message_loop.h"
+#include "base/thread_task_runner_handle.h"
 #include "base/time/time.h"
 #include "base/timer/timer.h"
 #include "ui/aura/window.h"
 #include "ui/aura/window_event_dispatcher.h"
 #include "ui/events/event.h"
 #include "ui/events/event_constants.h"
 #include "ui/gfx/geometry/insets.h"
 #include "ui/views/bubble/bubble_delegate.h"
 #include "ui/views/bubble/bubble_frame_view.h"
 #include "ui/views/controls/label.h"
@@ skipping 295 matching lines @@
 void ShelfTooltipManager::CancelHidingAnimation() {
   if (!widget_ || !widget_->GetNativeView())
     return;
 
   gfx::NativeView native_view = widget_->GetNativeView();
   wm::SetWindowVisibilityAnimationTransition(
       native_view, wm::ANIMATE_NONE);
 }
 
 void ShelfTooltipManager::CloseSoon() {
-  base::MessageLoopForUI::current()->PostTask(
+  base::ThreadTaskRunnerHandle::Get()->PostTask(
       FROM_HERE,
       base::Bind(&ShelfTooltipManager::Close, weak_factory_.GetWeakPtr()));
 }
 
 void ShelfTooltipManager::ShowInternal() {
   if (view_)
     view_->GetWidget()->Show();
 
   timer_.reset();
 }
@@ skipping 25 matching lines @@
 void ShelfTooltipManager::CreateTimer(int delay_in_ms) {
   base::OneShotTimer* new_timer = new base::OneShotTimer();
   new_timer->Start(FROM_HERE,
                    base::TimeDelta::FromMilliseconds(delay_in_ms),
                    this,
                    &ShelfTooltipManager::ShowInternal);
   timer_.reset(new_timer);
 }
 
 }  // namespace ash