Move guid generation from chrome/common/ to base/.

chrome/common/guid.h

-// Copyright (c) 2010 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_COMMON_GUID_H_
-#define CHROME_COMMON_GUID_H_
-#pragma once
-
-#include <string>
-
-#include "base/basictypes.h"
-#include "build/build_config.h"
-
-namespace guid {
-
-// Generate a 128-bit random GUID of the form: "%08X-%04X-%04X-%04X-%012llX".
-// If GUID generation fails an empty string is returned.
-// The POSIX implementation uses psuedo random number generation to create
-// the GUID.  The Windows implementation uses system services.
-std::string GenerateGUID();
-
-// Returns true if the input string conforms to the GUID format.
-bool IsValidGUID(const std::string& guid);
-
-#if defined(OS_POSIX)
-// For unit testing purposes only.  Do not use outside of tests.
-std::string RandomDataToGUIDString(const uint64 bytes[2]);
-#endif
-
-}  // namespace guid
-
-#endif  // CHROME_COMMON_GUID_H_