[Refactor] Consolidate the logic for whether a widget can be activated.

ui/views/widget/native_widget_aura.h

 // Copyright (c) 2012 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_NATIVE_WIDGET_AURA_H_
 #define UI_VIEWS_WIDGET_NATIVE_WIDGET_AURA_H_
 
 #include "base/memory/scoped_vector.h"
 #include "base/memory/weak_ptr.h"
 #include "ui/aura/client/focus_change_observer.h"
@@ skipping 188 matching lines @@
   // non-NULL.
   aura::Window* window_;
 
   // See class documentation for Widget in widget.h for a note about ownership.
   Widget::InitParams::Ownership ownership_;
 
   // The following factory is used for calls to close the NativeWidgetAura
   // instance.
   base::WeakPtrFactory<NativeWidgetAura> close_widget_factory_;
 
-  // Can we be made active?
-  bool can_activate_;
-
   // Are we in the destructor?
   bool destroying_;
 
   gfx::NativeCursor cursor_;
 
   // The saved window state for exiting full screen state.
   ui::WindowShowState saved_window_state_;
 
   scoped_ptr<TooltipManagerAura> tooltip_manager_;
 
   // Reorders child windows of |window_| associated with a view based on the
   // order of the associated views in the widget's view hierarchy.
   scoped_ptr<WindowReorderer> window_reorderer_;
 
   scoped_ptr<DropHelper> drop_helper_;
   int last_drop_operation_;
 
   DISALLOW_COPY_AND_ASSIGN(NativeWidgetAura);
 };
 
 }  // namespace views
 
 #endif  // UI_VIEWS_WIDGET_NATIVE_WIDGET_AURA_H_