[Linux] Fix browser relaunching, which broke after enabling NO_NEW_PRIVS by default.

chrome/browser/first_run/upgrade_util_linux.cc

 // Copyright (c) 2011 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/first_run/upgrade_util.h"
 
 #include "base/base_paths.h"
 #include "base/command_line.h"
 #include "base/file_util.h"
 #include "base/files/file_path.h"
 #include "base/logging.h"
 #include "base/path_service.h"
 #include "base/platform_file.h"
 #include "base/process/launch.h"
 #include "chrome/browser/first_run/upgrade_util_linux.h"
 
 namespace {
 
 double saved_last_modified_time_of_exe = 0;
 
 }  // namespace
 
 namespace upgrade_util {
 
 bool RelaunchChromeBrowser(const CommandLine& command_line) {
-  return base::LaunchProcess(command_line, base::LaunchOptions(), NULL);
+  base::LaunchOptions options;
+  // Don't set NO_NEW_PRIVS on the relaunched browser process.
+  options.allow_new_privs = true;
+  return base::LaunchProcess(command_line, options, NULL);
 }
 
 bool IsUpdatePendingRestart() {
   return saved_last_modified_time_of_exe != GetLastModifiedTimeOfExe();
 }
 
 void SaveLastModifiedTimeOfExe() {
   saved_last_modified_time_of_exe = GetLastModifiedTimeOfExe();
 }
 
 double GetLastModifiedTimeOfExe() {
   base::FilePath exe_file_path;
   if (!PathService::Get(base::FILE_EXE, &exe_file_path)) {
     LOG(WARNING) << "Failed to get base::FilePath object for FILE_EXE.";
     return saved_last_modified_time_of_exe;
   }
   base::File::Info exe_file_info;
   if (!base::GetFileInfo(exe_file_path, &exe_file_info)) {
     LOG(WARNING) << "Failed to get FileInfo object for FILE_EXE - "
                  << exe_file_path.value();
     return saved_last_modified_time_of_exe;
   }
   return exe_file_info.last_modified.ToDoubleT();
 }
 
 }  // namespace upgrade_util