Fix Chrome OS virtual keyboard accessibility

chrome/browser/chromeos/accessibility/select_to_speak_event_handler.h

 // Copyright 2016 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 CHROME_BROWSER_CHROMEOS_ACCESSIBILITY_SELECT_TO_SPEAK_EVENT_HANDLER_H_
 #define CHROME_BROWSER_CHROMEOS_ACCESSIBILITY_SELECT_TO_SPEAK_EVENT_HANDLER_H_
 
 #include <set>
 
 #include "base/macros.h"
@@ skipping 44 matching lines @@
 
   State state_ = INACTIVE;
 
   // The set of keys that are currently down. Updated whenever a key is
   // pressed or released.
   std::set<ui::KeyboardCode> keys_currently_down_;
   // The set of keys that have been pressed together. Updated whenever a key
   // is pressed, and only cleared when all keys are released.
   std::set<ui::KeyboardCode> keys_pressed_together_;
 
-  int last_view_storage_id_ = 0;
-
   DISALLOW_COPY_AND_ASSIGN(SelectToSpeakEventHandler);
 };
 
 }  // namespace chromeos
 
 #endif  // CHROME_BROWSER_CHROMEOS_ACCESSIBILITY_SELECT_TO_SPEAK_EVENT_HANDLER_H_