Use single "modifiers" field rather than boolean fields.

ash/accelerators/accelerator_table.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 ASH_ACCELERATORS_ACCELERATOR_TABLE_H_
 #define ASH_ACCELERATORS_ACCELERATOR_TABLE_H_
 #pragma once
 
 #include "ash/ash_export.h"
 #include "ui/aura/event.h"
@@ skipping 56 matching lines @@
   PRINT_WINDOW_HIERARCHY,
   ROTATE_SCREEN,
   TOGGLE_DESKTOP_BACKGROUND_MODE,
   TOGGLE_ROOT_WINDOW_FULL_SCREEN,
 #endif
 };
 
 struct AcceleratorData {
   bool trigger_on_press;
   ui::KeyboardCode keycode;
-  bool shift;
-  bool ctrl;
-  bool alt;
+  int modifiers;
   AcceleratorAction action;
 };
 
 // Accelerators handled by AcceleratorController.
 ASH_EXPORT extern const AcceleratorData kAcceleratorData[];
 
 // The number of elements in kAcceleratorData.
 ASH_EXPORT extern const size_t kAcceleratorDataLength;
 
 // Actions allowed while user is not signed in or screen is locked.
 ASH_EXPORT extern const AcceleratorAction kActionsAllowedAtLoginScreen[];
 
 // The number of elements in kActionsAllowedAtLoginScreen.
 ASH_EXPORT extern const size_t kActionsAllowedAtLoginScreenLength;
 
 }  // namespace ash
 
 #endif  // ASH_ACCELERATORS_ACCELERATOR_TABLE_H_