Move ReadFileToString to the base namespace.

remoting/host/config_file_watcher.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 "remoting/host/config_file_watcher.h"
 
 #include <string>
 
 #include "base/bind.h"
 #include "base/bind_helpers.h"
@@ skipping 162 matching lines @@
   // If the writer moves the new configuration file into place atomically,
   // this delay may not be necessary.
   if (!error && config_path_ == path)
     config_updated_timer_->Reset();
 }
 
 void ConfigFileWatcherImpl::ReloadConfig() {
   DCHECK(io_task_runner_->BelongsToCurrentThread());
 
   std::string config;
-  if (!file_util::ReadFileToString(config_path_, &config)) {
+  if (!base::ReadFileToString(config_path_, &config)) {
 #if defined(OS_WIN)
     // EACCESS may indicate a locking or sharing violation. Retry a few times
     // before reporting an error.
     if (errno == EACCES && retries_ < kMaxRetries) {
       PLOG(WARNING) << "Failed to read '" << config_path_.value() << "'";
 
       retries_ += 1;
       config_updated_timer_->Reset();
       return;
     }
@@ skipping 13 matching lines @@
   if (config_ != config) {
     config_ = config;
     main_task_runner_->PostTask(
         FROM_HERE,
         base::Bind(&ConfigFileWatcher::Delegate::OnConfigUpdated, delegate_,
                    config_));
   }
 }
 
 }  // namespace remoting