views: Add comment to Combobox's native wrapper about its lifetime.

views/controls/combobox/combobox.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_CONTROLS_COMBOBOX_COMBOBOX_H_
 #define VIEWS_CONTROLS_COMBOBOX_COMBOBOX_H_
 #pragma once
 
 #include <string>
 
@@ skipping 64 matching lines @@
   virtual bool SkipDefaultKeyEventProcessing(const KeyEvent& e) OVERRIDE;
   virtual void OnPaintFocusBorder(gfx::Canvas* canvas) OVERRIDE;
   virtual bool OnKeyPressed(const views::KeyEvent& e) OVERRIDE;
   virtual bool OnKeyReleased(const views::KeyEvent& e) OVERRIDE;
   virtual void OnFocus() OVERRIDE;
   virtual void OnBlur() OVERRIDE;
   virtual void GetAccessibleState(ui::AccessibleViewState* state) OVERRIDE;
 
  protected:
   // Overridden from View:
-  virtual void ViewHierarchyChanged(bool is_add, View* parent,
+  virtual void ViewHierarchyChanged(bool is_add,
+                                    View* parent,
                                     View* child) OVERRIDE;
   virtual std::string GetClassName() const OVERRIDE;
 
   // The object that actually implements the native combobox.
   NativeComboboxWrapper* native_wrapper_;
 
  private:
   // Our model.
   ui::ComboboxModel* model_;
 
   // Item change listener.
   Listener* listener_;
 
   // The current selection.
   int selected_item_;
 
   // The accessible name of the text field.
   string16 accessible_name_;
 
   DISALLOW_COPY_AND_ASSIGN(Combobox);
 };
 
 }  // namespace views
 
 #endif  // VIEWS_CONTROLS_COMBOBOX_COMBOBOX_H_