[ash-md] Fixed the effective text/icon colors in the system menu.

ash/common/system/chromeos/tray_tracing.cc

Index: ash/common/system/chromeos/tray_tracing.cc
diff --git a/ash/common/system/chromeos/tray_tracing.cc b/ash/common/system/chromeos/tray_tracing.cc
index a016421ef7936f2e724cb8a460254eabfd5a2042..e7899a383e6162d012b7b3b8196af6ffcb401a3f 100644
--- a/ash/common/system/chromeos/tray_tracing.cc
+++ b/ash/common/system/chromeos/tray_tracing.cc
@@ -71,7 +71,7 @@ class DefaultTracingView : public ActionableView {
     // TODO(tdanderson): Update the icon used for tracing or remove it from
     // the system menu. See crbug.com/625691.
     image_->SetImage(CreateVectorIcon(gfx::VectorIconId::CODE, kMenuIconSize,
-                                      style.GetForegroundColor()));
+                                      style.GetIconColor()));
   }
 
   bool PerformAction(const ui::Event& event) override {