Use base::OneShotTimer instead of base::Timer(false, false)

ui/views/controls/scrollbar/overlay_scroll_bar.h

 // 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.
 
 #ifndef UI_VIEWS_CONTROLS_SCROLLBAR_OVERLAY_SCROLL_BAR_H_
 #define UI_VIEWS_CONTROLS_SCROLLBAR_OVERLAY_SCROLL_BAR_H_
 
 #include "base/macros.h"
 #include "ui/views/controls/scrollbar/base_scroll_bar.h"
 #include "ui/views/controls/scrollbar/base_scroll_bar_thumb.h"
@@ skipping 41 matching lines @@
   };
   friend class Thumb;
 
   // Shows this (effectively, the thumb) without delay.
   void Show();
   // Hides this with a delay.
   void Hide();
   // Starts a countdown that hides this when it fires.
   void StartHideCountdown();
 
-  base::Timer hide_timer_;
+  base::OneShotTimer hide_timer_;
 
   DISALLOW_COPY_AND_ASSIGN(OverlayScrollBar);
 };
 
 }  // namespace views
 
 #endif  // UI_VIEWS_CONTROLS_SCROLLBAR_OVERLAY_SCROLL_BAR_H_