Remove last MD reference from TrayPopupUtils.

ash/common/system/tray/tray_constants.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_COMMON_SYSTEM_TRAY_TRAY_CONSTANTS_H_
 #define ASH_COMMON_SYSTEM_TRAY_TRAY_CONSTANTS_H_
 
 #include "ash/ash_export.h"
 
 typedef unsigned int SkColor;
@@ skipping 34 matching lines @@
 // Used for buttons that have borders.
 extern const int kTrayPopupButtonEndMargin;
 // The padding used on the left and right of labels. This applies to all labels
 // in the system menu.
 extern const int kTrayPopupLabelHorizontalPadding;
 
 // When transitioning between a detailed and a default view, this delay is used
 // before the transition starts.
 ASH_EXPORT extern const int kTrayDetailedViewTransitionDelayMs;
 
-// Padding used to adjust the slider position in volume row and brightness
-// row horizontally.
-extern const int kTrayPopupSliderPaddingMD;
-
 // Padding used on right side of labels to keep minimum distance to the next
 // item. This applies to all labels in the system menu.
 extern const int kTrayPopupLabelRightPadding;
 
 extern const int kTrayPopupDetailsIconWidth;
 extern const int kTrayPopupDetailsLabelExtraLeftMargin;
 extern const SkColor kTrayPopupHoverBackgroundColor;
 extern const int kTrayPopupScrollSeparatorHeight;
 extern const int kTrayRoundedBorderRadius;
 
@@ skipping 122 matching lines @@
 ASH_EXPORT int GetTrayConstant(TrayConstant constant);
 
 namespace test {
 const int kSettingsTrayItemViewId = 10000;
 const int kAccessibilityTrayItemViewId = 10001;
 }  // namespace test
 
 }  // namespace ash
 
 #endif  // ASH_COMMON_SYSTEM_TRAY_TRAY_CONSTANTS_H_