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

base/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_
+#ifndef BASE_BASE32_H_
+#define BASE_BASE32_H_
 
 #include <string>
 
+#include "base/base_export.h"
 #include "base/strings/string_piece.h"
 
-namespace base32 {
+namespace base {
 
 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,
+BASE_EXPORT std::string Base32Encode(
+    StringPiece input,
     Base32EncodePolicy policy = Base32EncodePolicy::INCLUDE_PADDING);
 
-}  // namespace base32
+}  // namespace base
 
-#endif  // COMPONENTS_BASE32_BASE32_H_
+#endif  // BASE_BASE32_H_