Port SkBase64 test to our test driver.

src/utils/SkBase64.h

-
 /*
  * Copyright 2006 The Android Open Source Project
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
-
 #ifndef SkBase64_DEFINED
 #define SkBase64_DEFINED
 
 #include "SkTypes.h"
 
 struct SkBase64 {
 public:
     enum Error {
         kNoError,
         kPadError,
         kBadCharError
     };
 
     SkBase64();
     Error decode(const char* src, size_t length);
     char* getData() { return fData; }
     /**
        Base64 encodes src into dst. encode is a pointer to at least 65 chars.
        encode[64] will be used as the pad character. Encodings other than the
        default encoding cannot be decoded.
     */
     static size_t Encode(const void* src, size_t length, void* dest, const char* encode = NULL);
 
-#ifdef SK_SUPPORT_UNITTEST
-    static void UnitTest();
-#endif
 private:
     Error decode(const void* srcPtr, size_t length, bool writeDestination);
 
     size_t fLength;
     char* fData;
     friend class SkImageBaseBitmap;
 };
 
 #endif // SkBase64_DEFINED