[Ash] Remove pre-MD code paths from HoverHighlightView

ash/common/system/tray/label_tray_view.cc

 // Copyright (c) 2012 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 "ash/common/system/tray/label_tray_view.h"
 
 #include "ash/common/system/tray/hover_highlight_view.h"
 #include "ash/common/system/tray/tray_constants.h"
 #include "ash/common/system/tray/view_click_listener.h"
 #include "ash/resources/grit/ash_resources.h"
@@ skipping 26 matching lines @@
     SetVisible(true);
   } else {
     SetVisible(false);
   }
 }
 
 views::View* LabelTrayView::CreateChildView(
     const base::string16& message) const {
   HoverHighlightView* child = new HoverHighlightView(click_listener_);
   gfx::ImageSkia icon_image = gfx::CreateVectorIcon(icon_, kMenuIconColor);
-  child->AddIconAndLabelForDefaultView(icon_image, message,
-                                       false /* highlight */);
+  child->AddIconAndLabelForDefaultView(icon_image, message);
   child->text_label()->SetMultiLine(true);
   child->text_label()->SetAllowCharacterBreak(true);
   child->SetExpandable(true);
   child->SetVisible(true);
   return child;
 }
 
 }  // namespace ash