[ash-md] Does not cancel overview when focus shifts from text fitler

ash/common/wm/overview/window_selector.h

 // Copyright 2013 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 ASH_COMMON_WM_OVERVIEW_WINDOW_SELECTOR_H_
 #define ASH_COMMON_WM_OVERVIEW_WINDOW_SELECTOR_H_
 
 #include <stddef.h>
 #include <stdint.h>
 
@@ skipping 139 matching lines @@
   // them refer to this particular overview session and are not cumulative:
   // The time when overview was started.
   base::Time overview_start_time_;
 
   // The number of arrow key presses.
   size_t num_key_presses_;
 
   // The number of items in the overview.
   size_t num_items_;
 
-  // Indicates if we are showing the selection widget.
-  bool showing_selection_widget_;
+  // Indicates if the text filter is shown on screen (rather than above it).
+  bool showing_text_filter_;
 
   // Window text filter widget. As the user writes on it, we filter the items
   // in the overview. It is also responsible for handling overview key events,
   // such as enter key to select.
   std::unique_ptr<views::Widget> text_filter_widget_;
 
   // Image used for text filter textfield.
   gfx::ImageSkia search_image_;
 
   // The current length of the string entered into the text filtering textfield.
@@ skipping 12 matching lines @@
   int text_filter_bottom_;
 
   bool is_shut_down_ = false;
 
   DISALLOW_COPY_AND_ASSIGN(WindowSelector);
 };
 
 }  // namespace ash
 
 #endif  // ASH_COMMON_WM_OVERVIEW_WINDOW_SELECTOR_H_