Move ReadFileToString to the base namespace.

net/tools/tld_cleanup/tld_cleanup_util.cc

 // Copyright 2013 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 "net/tools/tld_cleanup/tld_cleanup_util.h"
 
 #include "base/file_util.h"
 #include "base/logging.h"
 #include "base/strings/string_number_conversions.h"
 #include "base/strings/string_util.h"
@@ skipping 215 matching lines @@
     }
   }
 
   return result;
 }
 
 NormalizeResult NormalizeFile(const base::FilePath& in_filename,
                               const base::FilePath& out_filename) {
   RuleMap rules;
   std::string data;
-  if (!file_util::ReadFileToString(in_filename, &data)) {
+  if (!base::ReadFileToString(in_filename, &data)) {
     LOG(ERROR) << "Unable to read file";
     // We return success since we've already reported the error.
     return kSuccess;
   }
 
   NormalizeResult result = NormalizeDataToRuleMap(data, &rules);
 
   if (!WriteRules(rules, out_filename)) {
     LOG(ERROR) << "Error(s) writing output file";
     result = kError;
   }
 
   return result;
 }
 
 
 }  // namespace tld_cleanup
 }  // namespace net