Move crypto_helpers from sync to base

chrome/browser/sync/util/crypto_helpers_unittest.cc

-// Copyright (c) 2009 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/browser/sync/util/crypto_helpers.h"
-#include "testing/gtest/include/gtest/gtest.h"
-
-TEST(ChecksumTest, MD5ChecksumTest) {
-  uint8 buffer[256];
-  for (unsigned int i = 0; i < arraysize(buffer); ++i) {
-    buffer[i] = i;
-  }
-  MD5Calculator md5;
-  md5.AddData(buffer, arraysize(buffer));
-  std::string checksum("e2c865db4162bed963bfaa9ef6ac18f0");
-  ASSERT_EQ(checksum, md5.GetHexDigest());
-}
-
-TEST(CryptoHelpers, GetRandomBytes) {
-  for (int i = 1; i < 25; ++i) {
-    std::string random_bytes(i+1, ' ');
-    do {
-      GetRandomBytes(&random_bytes[0], i);
-      ASSERT_EQ(random_bytes[i], ' ');
-    } while (random_bytes[i - 1] == ' ');
-  }
-}