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

chrome/common/guid.cc

-// 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.
-
-#include "chrome/common/guid.h"
-
-#include "base/rand_util.h"
-#include "base/stringprintf.h"
-
-namespace guid {
-
-bool IsValidGUID(const std::string& guid) {
-  const size_t kGUIDLength = 36U;
-  if (guid.length() != kGUIDLength)
-    return false;
-
-  std::string hexchars = "0123456789ABCDEF";
-  for (uint32 i = 0; i < guid.length(); ++i) {
-    char current = guid[i];
-    if (i == 8 || i == 13 || i == 18 || i == 23) {
-      if (current != '-')
-        return false;
-    } else {
-      if (hexchars.find(current) == std::string::npos)
-        return false;
-    }
-  }
-
-  return true;
-}
-
-}  // namespace guid