Use NativeTheme to draw vertical menu separators.

chrome/browser/ui/libgtkui/native_theme_gtk2.cc

 // 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 "chrome/browser/ui/libgtkui/native_theme_gtk2.h"
 
 #include <gtk/gtk.h>
 
 #include "chrome/browser/ui/libgtkui/chrome_gtk_frame.h"
 #include "chrome/browser/ui/libgtkui/chrome_gtk_menu_subclasses.h"
@@ skipping 138 matching lines @@
     case kColorId_SelectedMenuItemForegroundColor:
       return GetTextColor(GetMenuItem(), SELECTED);
     case kColorId_FocusedMenuItemBackgroundColor:
       return GetBgColor(GetMenuItem(), SELECTED);
 
     case kColorId_EnabledMenuItemForegroundColor:
       return GetTextColor(GetMenuItem(), NORMAL);
     case kColorId_MenuItemSubtitleColor:
     case kColorId_DisabledMenuItemForegroundColor:
       return GetTextColor(GetMenuItem(), INSENSITIVE);
-    case kColorId_FocusedMenuButtonBorderColor:
-      return GetBgColor(GetEntry(), NORMAL);
-    case kColorId_HoverMenuButtonBorderColor:
-      return GetTextAAColor(GetEntry(), PRELIGHT);
     case kColorId_MenuBorderColor:
-    case kColorId_EnabledMenuButtonBorderColor:
-    case kColorId_MenuSeparatorColor: {
+    case kColorId_MenuSeparatorColor:
       return GetTextColor(GetMenuItem(), INSENSITIVE);
-    }
     case kColorId_MenuBackgroundColor:
       return GetBgColor(GetMenu(), NORMAL);
 
     // Label
     case kColorId_LabelEnabledColor:
       return GetTextColor(GetEntry(), NORMAL);
     case kColorId_LabelDisabledColor:
       return GetTextColor(GetLabel(), INSENSITIVE);
     case kColorId_LabelTextSelectionColor:
       return GetTextColor(GetLabel(), SELECTED);
@@ skipping 282 matching lines @@
 GtkWidget* NativeThemeGtk2::GetSeparator() const {
   static GtkWidget* fake_separator = nullptr;
 
   if (!fake_separator)
     fake_separator = gtk_hseparator_new();
 
   return fake_separator;
 }
 
 }  // namespace libgtkui