Move FileEnumerator to its own file, do some refactoring.

content/browser/zygote_host/zygote_host_impl_linux.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/zygote_host/zygote_host_impl_linux.h"
 
 #include <sys/socket.h>
 #include <sys/stat.h>
 #include <sys/types.h>
 #include <unistd.h>
 
 #include "base/base_switches.h"
 #include "base/command_line.h"
 #include "base/environment.h"
 #include "base/file_util.h"
+#include "base/files/file_enumerator.h"
 #include "base/linux_util.h"
 #include "base/logging.h"
 #include "base/memory/linked_ptr.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/metrics/histogram.h"
 #include "base/path_service.h"
 #include "base/posix/eintr_wrapper.h"
 #include "base/posix/unix_domain_socket_linux.h"
 #include "base/process_util.h"
 #include "base/string_number_conversions.h"
@@ skipping 338 matching lines @@
   // problems with other, non-SELinux distros.
   //
   // So we just check for files in /selinux. This isn't foolproof, but it's not
   // bad and it's easy.
 
   static bool selinux;
   static bool selinux_valid = false;
 
   if (!selinux_valid) {
     const base::FilePath kSelinuxPath("/selinux");
-    file_util::FileEnumerator en(kSelinuxPath, false,
-                                 file_util::FileEnumerator::FILES);
+    base::FileEnumerator en(kSelinuxPath, false, base::FileEnumerator::FILES);
     bool has_selinux_files = !en.Next().empty();
 
     selinux = access(kSelinuxPath.value().c_str(), X_OK) == 0 &&
               has_selinux_files;
     selinux_valid = true;
   }
 
   if (using_suid_sandbox_ && !selinux) {
 #if defined(USE_TCMALLOC)
     // If heap profiling is running, these processes are not exiting, at least
@@ skipping 120 matching lines @@
   return RenderSandboxHostLinux::GetInstance()->pid();
 }
 
 int ZygoteHostImpl::GetSandboxStatus() const {
   if (have_read_sandbox_status_word_)
     return sandbox_status_;
   return 0;
 }
 
 }  // namespace content