linux_aura: Don't inject black in WrenchMenu::GetForegroundColor().

ui/views/controls/menu/menu_delegate.cc

Index: ui/views/controls/menu/menu_delegate.cc
diff --git a/ui/views/controls/menu/menu_delegate.cc b/ui/views/controls/menu/menu_delegate.cc
index 920fd53e7eab629d1fd9d6a625be78441d585715..699377f6da224720657e0ca593efdc0a6f921ea0 100644
--- a/ui/views/controls/menu/menu_delegate.cc
+++ b/ui/views/controls/menu/menu_delegate.cc
@@ -21,6 +21,11 @@ const gfx::FontList* MenuDelegate::GetLabelFontList(int id) const {
   return NULL;
 }
 
+bool MenuDelegate::GetShouldUseDisabledEmphasizedForegroundColor(
+    int command_id) const {
+  return false;
+}
+
 bool MenuDelegate::GetBackgroundColor(int command_id,
                                       bool is_hovered,
                                       SkColor* override_color) const {