Move enable extensions define to a build flag.

chrome/browser/prerender/prerender_link_manager.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 "chrome/browser/prerender/prerender_link_manager.h"
 
 #include <functional>
 #include <limits>
 #include <memory>
 #include <set>
 #include <string>
 #include <utility>
 
 #include "base/metrics/field_trial.h"
 #include "base/metrics/histogram_macros.h"
 #include "chrome/browser/prerender/prerender_contents.h"
 #include "chrome/browser/prerender/prerender_handle.h"
 #include "chrome/browser/prerender/prerender_manager.h"
 #include "chrome/browser/prerender/prerender_manager_factory.h"
 #include "chrome/common/prerender_messages.h"
 #include "chrome/common/prerender_types.h"
 #include "content/public/browser/render_process_host.h"
 #include "content/public/browser/render_view_host.h"
 #include "content/public/browser/session_storage_namespace.h"
 #include "content/public/common/referrer.h"
+#include "extensions/features/features.h"
 #include "ui/gfx/geometry/size.h"
 #include "url/gurl.h"
 
-#if defined(ENABLE_EXTENSIONS)
+#if BUILDFLAG(ENABLE_EXTENSIONS)
 #include "components/guest_view/browser/guest_view_base.h"
 #endif
 
 using base::TimeDelta;
 using base::TimeTicks;
 using content::RenderViewHost;
 using content::SessionStorageNamespace;
 
 namespace prerender {
 
@@ skipping 122 matching lines @@
                                           int prerender_id,
                                           const GURL& url,
                                           uint32_t rel_types,
                                           const content::Referrer& referrer,
                                           const gfx::Size& size,
                                           int render_view_route_id) {
   DCHECK_EQ(static_cast<LinkPrerender*>(NULL),
             FindByLauncherChildIdAndPrerenderId(launcher_child_id,
                                                 prerender_id));
 
-#if defined(ENABLE_EXTENSIONS)
+#if BUILDFLAG(ENABLE_EXTENSIONS)
   content::RenderViewHost* rvh =
       content::RenderViewHost::FromID(launcher_child_id, render_view_route_id);
   content::WebContents* web_contents =
       rvh ? content::WebContents::FromRenderViewHost(rvh) : NULL;
   // Guests inside <webview> do not support cross-process navigation and so we
   // do not allow guests to prerender content.
   if (guest_view::GuestViewBase::IsGuest(web_contents))
     return;
 #endif
 
@@ skipping 337 matching lines @@
   if (!prerender)
     return;
 
   Send(prerender->launcher_child_id,
        new PrerenderMsg_OnPrerenderStop(prerender->prerender_id));
   RemovePrerender(prerender);
   StartPrerenders();
 }
 
 }  // namespace prerender