Move ReadFileToString to the base namespace.

chrome/test/webdriver/webdriver_session.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/test/webdriver/webdriver_session.h"
 
 #include <sstream>
 #include <vector>
 
 #include "base/bind.h"
@@ skipping 1826 matching lines @@
 
   base::FilePath path = screenshots_dir.path().AppendASCII("screen");
   RunSessionTask(base::Bind(
       &Automation::CaptureEntirePageAsPNG,
       base::Unretained(automation_.get()),
       current_target_.view_id,
       path,
       &error));
   if (error)
     return error;
-  if (!file_util::ReadFileToString(path, png))
+  if (!base::ReadFileToString(path, png))
     return new Error(kUnknownError, "Could not read screenshot file");
   return NULL;
 }
 
 #if !defined(NO_TCMALLOC) && (defined(OS_LINUX) || defined(OS_CHROMEOS))
 Error* Session::HeapProfilerDump(const std::string& reason) {
   // TODO(dmikurube): Support browser processes.
   Error* error = NULL;
   RunSessionTask(base::Bind(
       &Automation::HeapProfilerDump,
@@ skipping 80 matching lines @@
        !iter.IsAtEnd(); iter.Advance()) {
     Error* error = SetPreference(iter.key(), false /* is_user_pref */,
                                  iter.value().DeepCopy());
     if (error)
       return error;
   }
   return NULL;
 }
 
 }  // namespace webdriver