Implement restart-required message on Linux.

chrome/common/render_messages.h

 // 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.
 
 // Multiply-included file, no traditional include guard.
 #include <stdint.h>
 #include <string>
 #include <vector>
 
 #include "base/files/file_path.h"
@@ skipping 29 matching lines @@
   kAllowed,
   kBlocked,
   kBlockedByPolicy,
   kComponentUpdateRequired,
   kDisabled,
   kFlashHiddenPreferHtml,
   kNotFound,
   kOutdatedBlocked,
   kOutdatedDisallowed,
   kPlayImportantContent,
+  kRestartRequired,
   kUnauthorized,
 };
 
 namespace IPC {
 
 template <>
 struct ParamTraits<ContentSettingsPattern> {
   typedef ContentSettingsPattern param_type;
   static void GetSize(base::PickleSizer* s, const param_type& p);
   static void Write(base::Pickle* m, const param_type& p);
@@ skipping 579 matching lines @@
 
 // Record a sample string to a Rappor metric.
 IPC_MESSAGE_CONTROL2(ChromeViewHostMsg_RecordRappor,
                      std::string /* metric */,
                      std::string /* sample */)
 
 // Record a domain and registry of a url to a Rappor metric.
 IPC_MESSAGE_CONTROL2(ChromeViewHostMsg_RecordRapporURL,
                      std::string /* metric */,
                      GURL /* sample url */)