Move crypto_helpers from sync to base

chrome/common/random.cc

+// 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.
+
+#include "chrome/common/random.h"
+
+#include <string>
+
+#include "base/base64.h"
+#include "base/rand_util.h"
+
+std::string Generate128BitRandomBase64String() {
+  const int kNumberBytes = 128 / 8;
+  std::string random_bytes(kNumberBytes, ' ');
+  base::RandBytes(&random_bytes[0], kNumberBytes);
+  std::string base64_encoded_bytes;
+  base::Base64Encode(random_bytes, &base64_encoded_bytes);
+  return base64_encoded_bytes;
+}