Move ReadFileToString to the base namespace.

testing/android/native_test_util.cc

 // Copyright (c) 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 "testing/android/native_test_util.h"
 
 #include "base/file_util.h"
 #include "base/files/file_path.h"
 #include "base/strings/string_tokenizer.h"
 #include "base/strings/string_util.h"
@@ skipping 13 matching lines @@
 
 }  // namespace
 
 namespace testing {
 namespace native_test_util {
 
 void ParseArgsFromCommandLineFile(
     const char* path, std::vector<std::string>* args) {
   base::FilePath command_line(path);
   std::string command_line_string;
-  if (file_util::ReadFileToString(command_line, &command_line_string)) {
+  if (base::ReadFileToString(command_line, &command_line_string)) {
     ParseArgsFromString(command_line_string, args);
   }
 }
 
 int ArgsToArgv(const std::vector<std::string>& args,
                 std::vector<char*>* argv) {
   // We need to pass in a non-const char**.
   int argc = args.size();
 
   argv->resize(argc + 1);
   for (int i = 0; i < argc; ++i) {
     (*argv)[i] = const_cast<char*>(args[i].c_str());
   }
   (*argv)[argc] = NULL;  // argv must be NULL terminated.
 
   return argc;
 }
 
 }  // namespace native_test_util
 }  // namespace testing