Move base32 into base so that it can be used within base.

components/base32/base32.h

-// Copyright 2016 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 COMPONENTS_BASE32_BASE32_H_
-#define COMPONENTS_BASE32_BASE32_H_
-
-#include <string>
-
-#include "base/strings/string_piece.h"
-
-namespace base32 {
-
-enum class Base32EncodePolicy {
-  // Include the trailing padding in the output, when necessary.
-  INCLUDE_PADDING,
-  // Omit trailing padding in the output. Such an output will not be decodable
-  // unless |input.size()| is known by the decoder. Its size is guaranteed to be
-  // |ceil(input.size() * 8.0 / 5.0)|.
-  OMIT_PADDING
-};
-
-// Encodes the |input| string in base32, defined in RFC 4648:
-// https://tools.ietf.org/html/rfc4648#section-5
-//
-// The |policy| defines whether padding should be included or omitted from the
-// encoded output.
-std::string Base32Encode(
-    base::StringPiece input,
-    Base32EncodePolicy policy = Base32EncodePolicy::INCLUDE_PADDING);
-
-}  // namespace base32
-
-#endif  // COMPONENTS_BASE32_BASE32_H_