mus: Use TooltipManagerAura in NativeWidgetMus.

ui/views/widget/tooltip_manager_aura.h

 // Copyright (c) 2011 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_WIDGET_TOOLTIP_MANAGER_AURA_H_
 #define UI_VIEWS_WIDGET_TOOLTIP_MANAGER_AURA_H_
 
 #include "base/compiler_specific.h"
 #include "base/macros.h"
 #include "base/strings/string16.h"
 #include "ui/gfx/geometry/point.h"
+#include "ui/views/views_export.h"
 #include "ui/views/widget/tooltip_manager.h"
 
 namespace aura {
 class Window;
 }
 
 namespace gfx {
 class FontList;
 }
 
 namespace views {
 
 class Widget;
 
 // TooltipManager implementation for Aura.
-class TooltipManagerAura : public TooltipManager {
+class VIEWS_EXPORT TooltipManagerAura : public TooltipManager {
  public:
   explicit TooltipManagerAura(Widget* widget);
   ~TooltipManagerAura() override;
 
   // If |source| has capture this finds the Widget under the mouse and invokes
   // UpdateTooltip() on it's TooltipManager. This is necessary as when capture
   // is held mouse events are only delivered to the Window that has capture even
   // though we may show tooltips for the Window under the mouse.
   static void UpdateTooltipManagerForCapture(Widget* source);
 
@@ skipping 17 matching lines @@
 
   Widget* widget_;
   base::string16 tooltip_text_;
 
   DISALLOW_COPY_AND_ASSIGN(TooltipManagerAura);
 };
 
 }  // namespace views
 
 #endif  // UI_VIEWS_WIDGET_TOOLTIP_MANAGER_AURA_H_