Disables tooltips if we can't create the tooltip window. I still don't

views/widget/tooltip_manager_win.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 VIEWS_WIDGET_TOOLTIP_MANAGER_WIN_H_
 #define VIEWS_WIDGET_TOOLTIP_MANAGER_WIN_H_
 #pragma once
 
 #include <windows.h>
 #include <commctrl.h>
@@ skipping 44 matching lines @@
 //
 // Lastly, you'll need to override GetTooltipManager.
 //
 // See NativeWidgetWin for an example of this in action.
 class TooltipManagerWin : public TooltipManager {
  public:
   // Creates a TooltipManager for the specified Widget and parent window.
   explicit TooltipManagerWin(Widget* widget);
   virtual ~TooltipManagerWin();
 
+  // Initializes the TooltipManager returning whether initialization was
+  // successful. If this returns false the TooltipManager should be destroyed
+  // and not used.
+  bool Init();
+
   // Notification that the view hierarchy has changed in some way.
   virtual void UpdateTooltip();
 
   // Invoked when the tooltip text changes for the specified views.
   virtual void TooltipTextChanged(View* view);
 
   // Invoked when toolbar icon gets focus.
   virtual void ShowKeyboardTooltip(View* view);
 
   // Invoked when toolbar loses focus.
   virtual void HideKeyboardTooltip();
 
   // Message handlers. These forward to the tooltip control.
   virtual void OnMouse(UINT u_msg, WPARAM w_param, LPARAM l_param);
   LRESULT OnNotify(int w_param, NMHDR* l_param, bool* handled);
 
  protected:
-  virtual void Init();
-
   // Returns the Widget we're showing tooltips for.
   gfx::NativeView GetParent();
 
   // Updates the tooltip for the specified location.
   void UpdateTooltip(const gfx::Point& location);
 
   // Tooltip control window.
   HWND tooltip_hwnd_;
 
   // Tooltip information.
@@ skipping 47 matching lines @@
   // Used to register DestroyTooltipWindow function with PostDelayedTask
   // function.
   ScopedRunnableMethodFactory<TooltipManagerWin> keyboard_tooltip_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(TooltipManagerWin);
 };
 
 }  // namespace views
 
 #endif // VIEWS_WIDGET_TOOLTIP_MANAGER_WIN_H_