Move FileEnumerator to its own file, do some refactoring.

chrome/browser/component_updater/pnacl/pnacl_component_installer.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/component_updater/pnacl/pnacl_component_installer.h"
 
 #include "base/base_paths.h"
 #include "base/bind.h"
 #include "base/command_line.h"
 #include "base/compiler_specific.h"
 #include "base/file_util.h"
+#include "base/files/file_enumerator.h"
 #include "base/files/file_path.h"
 #include "base/json/json_file_value_serializer.h"
 #include "base/logging.h"
 #include "base/path_service.h"
 #include "base/string_util.h"
 #include "base/values.h"
 #include "base/version.h"
 #include "base/win/windows_version.h"
 #include "build/build_config.h"
 #include "chrome/browser/browser_process.h"
@@ skipping 97 matching lines @@
 // If we don't have Pnacl installed, this is the version we claim.
 const char kNullVersion[] = "0.0.0.0";
 
 bool GetLatestPnaclDirectory(PnaclComponentInstaller* pci,
                              base::FilePath* latest_dir,
                              Version* latest_version,
                              std::vector<base::FilePath>* older_dirs) {
   // Enumerate all versions starting from the base directory.
   base::FilePath base_dir = pci->GetPnaclBaseDirectory();
   bool found = false;
-  file_util::FileEnumerator
-      file_enumerator(base_dir, false, file_util::FileEnumerator::DIRECTORIES);
+  base::FileEnumerator
+      file_enumerator(base_dir, false, base::FileEnumerator::DIRECTORIES);
   for (base::FilePath path = file_enumerator.Next(); !path.value().empty();
        path = file_enumerator.Next()) {
     Version version(path.BaseName().MaybeAsASCII());
     if (!version.IsValid())
       continue;
     if (found) {
       if (version.CompareTo(*latest_version) > 0) {
         older_dirs->push_back(*latest_dir);
         *latest_dir = path;
         *latest_version = version;
@@ skipping 287 matching lines @@
   // No need to check the commandline flags again here.
   // We could only have gotten here after RegisterPnaclComponent
   // found --enable-pnacl, since that is where we create the profile_observer_,
   // which in turn calls ReRegisterPnacl.
   DCHECK(per_user_);
   // Figure out profile information, before proceeding to look for files.
   BrowserThread::PostTask(
       BrowserThread::UI, FROM_HERE,
       base::Bind(&GetProfileInformation, this));
 }