Make USE_EXTERNAL_POPUP_MENU local to content.

content/browser/web_contents/web_contents_view_aura.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 "content/browser/web_contents/web_contents_view_aura.h"
 
 #include <stddef.h>
 #include <stdint.h>
 
 #include "base/auto_reset.h"
@@ skipping 1309 matching lines @@
 
 void WebContentsViewAura::OnWindowVisibilityChanged(aura::Window* window,
                                                     bool visible) {
   // Ignore any visibility changes in the hierarchy below.
   if (window != window_.get() && window_->Contains(window))
     return;
 
   web_contents_->UpdateWebContentsVisibility(visible);
 }
 
-#if defined(USE_EXTERNAL_POPUP_MENU)
+#if BUILDFLAG(USE_EXTERNAL_POPUP_MENU)
 void WebContentsViewAura::ShowPopupMenu(RenderFrameHost* render_frame_host,
                                         const gfx::Rect& bounds,
                                         int item_height,
                                         double item_font_size,
                                         int selected_item,
                                         const std::vector<MenuItem>& items,
                                         bool right_aligned,
                                         bool allow_multiple_selection) {
   NOTIMPLEMENTED() << " show " << items.size() << " menu items";
 }
 
 void WebContentsViewAura::HidePopupMenu() {
   NOTIMPLEMENTED();
 }
 #endif
 
 }  // namespace content