Use NativeTheme to draw vertical menu separators.

ui/native_theme/native_theme_mac.mm

 // Copyright (c) 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.
 
 #include "ui/native_theme/native_theme_mac.h"
 
 #import <Cocoa/Cocoa.h>
 #include <stddef.h>
 
 #include "base/mac/mac_util.h"
@@ skipping 164 matching lines @@
   switch (color_id) {
     case kColorId_WindowBackground:
       return NSSystemColorToSkColor([NSColor windowBackgroundColor]);
     case kColorId_DialogBackground:
       return kDialogBackgroundColor;
     case kColorId_BubbleBackground:
       return SK_ColorWHITE;
 
     case kColorId_FocusedBorderColor:
       return NSSystemColorToSkColor([NSColor keyboardFocusIndicatorColor]);
-    case kColorId_FocusedMenuButtonBorderColor:
-      return NSSystemColorToSkColor([NSColor keyboardFocusIndicatorColor]);
     case kColorId_UnfocusedBorderColor:
       return NSSystemColorToSkColor([NSColor controlColor]);
 
     // Buttons and labels.
-    case kColorId_HoverMenuButtonBorderColor:
-      return NSSystemColorToSkColor([NSColor controlBackgroundColor]);
     case kColorId_ButtonEnabledColor:
-    case kColorId_EnabledMenuButtonBorderColor:
     case kColorId_LabelEnabledColor:
     case kColorId_ProminentButtonColor:
       return NSSystemColorToSkColor([NSColor controlTextColor]);
     case kColorId_ButtonDisabledColor:
     case kColorId_LabelDisabledColor:
       return NSSystemColorToSkColor([NSColor disabledControlTextColor]);
     case kColorId_ButtonHoverColor:
       return NSSystemColorToSkColor([NSColor selectedControlTextColor]);
     case kColorId_LabelTextSelectionColor:
       return NSSystemColorToSkColor([NSColor selectedTextColor]);
@@ skipping 231 matching lines @@
   canvas->drawDRRect(outer_shape, shape, flags);
 }
 
 NativeThemeMac::NativeThemeMac() {
 }
 
 NativeThemeMac::~NativeThemeMac() {
 }
 
 }  // namespace ui