ash: Explicitly enumerate repeatable accelerators.

ash/accelerators/exit_warning_handler.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_ACCELERATORS_EXIT_WARNING_HANDLER_H_
 #define ASH_ACCELERATORS_EXIT_WARNING_HANDLER_H_
 
 #include <memory>
 
 #include "ash/ash_export.h"
 #include "base/macros.h"
 #include "base/timer/timer.h"
 #include "ui/base/accelerators/accelerator.h"
 
 namespace views {
 class Widget;
 }
 
 namespace ash {
 
-// In order to avoid accidental exits when the user presses the exit
-// shortcut by mistake, we require the user press it twice within a
-// period of time. During that time we show a popup informing the
-// user of this.
+// In order to avoid accidental exits when the user presses the exit shortcut by
+// mistake, we require that the user press it twice within a short period of
+// time. During that time we show a popup informing the user of this.
 //
 // Notes:
 //
-// The corresponding accelerator must be non-repeatable (see
-// kNonrepeatableActions in accelerator_table.cc). Otherwise the "Double Press
-// Exit" will be activated just by holding it down, i.e. probably every time.
+// The corresponding accelerator must not be repeatable (see kRepeatableActions
+// in accelerator_table.cc). Otherwise, the "Double Press Exit" will be
+// activated just by holding it down, i.e. probably every time.
 //
 // State Transition Diagrams:
 //
 //  IDLE
 //   | Press
 //  WAIT_FOR_DOUBLE_PRESS action: show ui & start timers
 //   | Press (before time limit )
 //  EXITING action: hide ui, stop timer, exit
 //
 //  IDLE
@@ skipping 35 matching lines @@
   // Flag to suppress starting the timer for testing. For test we call
   // TimerAction() directly to simulate the expiration of the timer.
   bool stub_timer_for_test_;
 
   DISALLOW_COPY_AND_ASSIGN(ExitWarningHandler);
 };
 
 }  // namespace ash
 
 #endif  // ASH_ACCELERATORS_EXIT_WARNING_HANDLER_H_