Move ReadFileToString to the base namespace.

chrome/browser/chromeos/version_loader.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/chromeos/version_loader.h"
 
 #include <vector>
 
 #include "base/bind.h"
 #include "base/file_util.h"
@@ skipping 117 matching lines @@
   }
   return std::string();
 }
 
 void VersionLoader::Backend::GetVersion(VersionFormat format,
                                         std::string* version) {
   DCHECK(BrowserThread::GetBlockingPool()->RunsTasksOnCurrentThread());
 
   std::string contents;
   const base::FilePath file_path(kPathVersion);
-  if (file_util::ReadFileToString(file_path, &contents)) {
+  if (base::ReadFileToString(file_path, &contents)) {
     *version = ParseVersion(
         contents,
         (format == VERSION_FULL) ? kFullVersionPrefix : kVersionPrefix);
   }
 
   if (format == VERSION_SHORT_WITH_DATE) {
     base::PlatformFileInfo fileinfo;
     if (file_util::GetFileInfo(file_path, &fileinfo)) {
       base::Time::Exploded ctime;
       fileinfo.creation_time.UTCExplode(&ctime);
       *version += base::StringPrintf("-%02u.%02u.%02u",
                                      ctime.year % 100,
                                      ctime.month,
                                      ctime.day_of_month);
     }
   }
 }
 
 void VersionLoader::Backend::GetFirmware(std::string* firmware) {
   DCHECK(BrowserThread::GetBlockingPool()->RunsTasksOnCurrentThread());
 
   std::string contents;
   const base::FilePath file_path(kPathFirmware);
-  if (file_util::ReadFileToString(file_path, &contents)) {
+  if (base::ReadFileToString(file_path, &contents)) {
     *firmware = ParseFirmware(contents);
   }
 }
 
 }  // namespace chromeos