linux and chromeos: Turn on -Wunused-const-variable.

ash/system/chromeos/power/tray_power.cc

 // 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.
 
 #include "ash/system/chromeos/power/tray_power.h"
 
 #include "ash/ash_switches.h"
 #include "ash/system/chromeos/power/power_status_view.h"
 #include "ash/system/date/date_view.h"
 #include "ash/system/system_notifier.h"
@@ skipping 18 matching lines @@
 #include "ui/views/view.h"
 #include "ui/views/widget/widget.h"
 
 using message_center::MessageCenter;
 using message_center::Notification;
 
 namespace ash {
 namespace internal {
 
 namespace {
-// Top/bottom padding of the text items.
-const int kPaddingVertical = 10;
-// Specify min width of status label for layout.
-const int kLabelMinWidth = 120;
 // Notification times.
 const int kCriticalSeconds = 5 * 60;
 const int kLowPowerSeconds = 15 * 60;
 const int kNoWarningSeconds = 30 * 60;
 // Notification in battery percentage.
 const double kCriticalPercentage = 5.0;
 const double kLowPowerPercentage = 10.0;
 const double kNoWarningPercentage = 15.0;
 
 }  // namespace
@@ skipping 245 matching lines @@
       return false;
     case NOTIFICATION_CRITICAL:
       return false;
   }
   NOTREACHED();
   return false;
 }
 
 }  // namespace internal
 }  // namespace ash