Convert enable_plugins to a buildflag header.

extensions/browser/guest_view/web_view/web_view_permission_helper.h

 // Copyright 2014 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.
 
 #ifndef EXTENSIONS_BROWSER_GUEST_VIEW_WEB_VIEW_WEB_VIEW_PERMISSION_HELPER_H_
 #define EXTENSIONS_BROWSER_GUEST_VIEW_WEB_VIEW_WEB_VIEW_PERMISSION_HELPER_H_
 
 #include "base/macros.h"
 #include "base/memory/weak_ptr.h"
 #include "base/metrics/user_metrics_action.h"
 #include "components/guest_view/common/guest_view_constants.h"
 #include "content/public/browser/web_contents.h"
 #include "content/public/browser/web_contents_observer.h"
 #include "content/public/common/media_stream_request.h"
 #include "extensions/browser/guest_view/web_view/web_view_permission_types.h"
+#include "ppapi/features/features.h"
 
 using base::UserMetricsAction;
 
 namespace extensions {
 
 class WebViewGuest;
 class WebViewPermissionHelperDelegate;
 
 // WebViewPermissionHelper manages <webview> permission requests. This helper
 // class is owned by WebViewGuest. Its purpose is to request permission for
@@ skipping 108 matching lines @@
   void CancelPendingPermissionRequest(int request_id);
 
   WebViewGuest* web_view_guest() { return web_view_guest_; }
 
  private:
   void OnMediaPermissionResponse(const content::MediaStreamRequest& request,
                                  const content::MediaResponseCallback& callback,
                                  bool allow,
                                  const std::string& user_input);
 
-#if defined(ENABLE_PLUGINS)
+#if BUILDFLAG(ENABLE_PLUGINS)
   // content::WebContentsObserver implementation.
   bool OnMessageReceived(const IPC::Message& message,
                          content::RenderFrameHost* render_frame_host) override;
   bool OnMessageReceived(const IPC::Message& message) override;
-#endif  // defined(ENABLE_PLUGINS)
+#endif  // BUILDFLAG(ENABLE_PLUGINS)
 
   // A counter to generate a unique request id for a permission request.
   // We only need the ids to be unique for a given WebViewGuest.
   int next_permission_request_id_;
 
   WebViewPermissionHelper::RequestMap pending_permission_requests_;
 
   std::unique_ptr<WebViewPermissionHelperDelegate>
       web_view_permission_helper_delegate_;
 
   WebViewGuest* const web_view_guest_;
 
   base::WeakPtrFactory<WebViewPermissionHelper> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(WebViewPermissionHelper);
 };
 
 }  // namespace extensions
 
 #endif  // EXTENSIONS_BROWSER_GUEST_VIEW_WEB_VIEW_WEB_VIEW_PERMISSION_HELPER_H_