Make Widget::Show() creates active windows.

ui/views/widget/widget.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_WIDGET_H_
 #define UI_VIEWS_WIDGET_WIDGET_H_
 
 #include <set>
 #include <stack>
 #include <vector>
@@ skipping 412 matching lines @@
   // TODO(beng): Move off public API.
   // Closes the widget immediately. Compare to |Close|. This will destroy the
   // window handle associated with this Widget, so should not be called from
   // any code that expects it to be valid beyond this call.
   void CloseNow();
 
   // Whether the widget has been asked to close itself. In particular this is
   // set to true after Close() has been invoked on the NativeWidget.
   bool IsClosed() const;
 
-  // Shows or hides the widget, without changing activation state.
+  // Shows the widget and activates it.
   virtual void Show();
+  // Hides the widget.
   void Hide();
 
   // Like Show(), but does not activate the window.
   void ShowInactive();
 
   // Activates the widget, assuming it already exists and is visible.
   void Activate();
 
   // Deactivates the widget, making the next window in the Z order the active
   // window.
@@ skipping 442 matching lines @@
   // True when window movement via mouse interaction with the frame should be
   // disabled.
   bool movement_disabled_;
 
   DISALLOW_COPY_AND_ASSIGN(Widget);
 };
 
 }  // namespace views
 
 #endif  // UI_VIEWS_WIDGET_WIDGET_H_