Use NativeTheme to draw vertical menu separators.

ui/native_theme/native_theme_dark_aura.cc

 // Copyright 2015 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 "ui/native_theme/native_theme_dark_aura.h"
 
 #include "ui/gfx/color_palette.h"
 
 namespace ui {
 
@@ skipping 98 matching lines @@
     case kColorId_BlueButtonHoverColor:
     case kColorId_BlueButtonShadowColor:
     case kColorId_EnabledMenuItemForegroundColor:
     case kColorId_DisabledMenuItemForegroundColor:
     case kColorId_SelectedMenuItemForegroundColor:
     case kColorId_FocusedMenuItemBackgroundColor:
     case kColorId_MenuItemSubtitleColor:
     case kColorId_MenuSeparatorColor:
     case kColorId_MenuBackgroundColor:
     case kColorId_MenuBorderColor:
-    case kColorId_EnabledMenuButtonBorderColor:
-    case kColorId_FocusedMenuButtonBorderColor:
-    case kColorId_HoverMenuButtonBorderColor:
     case kColorId_LinkDisabled:
     case kColorId_TextfieldReadOnlyColor:
     case kColorId_TextfieldReadOnlyBackground:
     case kColorId_TooltipBackground:
     case kColorId_TooltipText:
     case kColorId_TreeBackground:
     case kColorId_TreeText:
     case kColorId_TreeSelectedText:
     case kColorId_TreeSelectedTextUnfocused:
     case kColorId_TreeSelectionBackgroundFocused:
@@ skipping 24 matching lines @@
 
   NOTREACHED();
   return gfx::kPlaceholderColor;
 }
 
 NativeThemeDarkAura::NativeThemeDarkAura() : NativeThemeAura(false) {}
 
 NativeThemeDarkAura::~NativeThemeDarkAura() {}
 
 }  // namespace ui