MacViews GN: Get chrome compiling with mac_views_browser = true

chrome/browser/ui/proximity_auth/proximity_auth_error_bubble_stub.cc

 // Copyright 2015 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/proximity_auth/proximity_auth_error_bubble.h"
 
 #include "base/logging.h"
 
-#if !defined(TOOLKIT_VIEWS) || !defined(USE_AURA)
 void ShowProximityAuthErrorBubble(const base::string16& message,
                                   const gfx::Range& link_range,
                                   const GURL& link_url,
                                   const gfx::Rect& anchor_rect,
                                   content::WebContents* web_contents) {
   NOTIMPLEMENTED();
 }
 
 void HideProximityAuthErrorBubble() {
   NOTIMPLEMENTED();
 }
-#endif