Refactor chromedriver's script execution to reduce amount of custom Value parsing.

chrome/test/webdriver/utility_functions.h

-// 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.
-
-#ifndef CHROME_TEST_WEBDRIVER_UTILITY_FUNCTIONS_H_
-#define CHROME_TEST_WEBDRIVER_UTILITY_FUNCTIONS_H_
-
-#include <string>
-#include <vector>
-
-class FilePath;
-
-namespace base {
-class Value;
-}
-
-namespace webdriver {
-
-// Generates a random, 32-character hexidecimal ID.
-std::string GenerateRandomID();
-
-// Returns the equivalent JSON string for the given value.
-std::string JsonStringify(const base::Value* value);
-
-#if defined(OS_MACOSX)
-// Gets the paths to the user and local application directory.
-void GetApplicationDirs(std::vector<FilePath>* app_dirs);
-#endif
-
-}  // namespace webdriver
-
-#endif  // CHROME_TEST_WEBDRIVER_UTILITY_FUNCTIONS_H_