Port SkBase64 test to our test driver.

src/utils/SkBase64.h

Index: src/utils/SkBase64.h
diff --git a/src/utils/SkBase64.h b/src/utils/SkBase64.h
index 5bf90066327b2c4fdb5ada39c96b6e2ae4de00cd..ba66dd2f47796bc16dc2143c84e0665725003994 100644
--- a/src/utils/SkBase64.h
+++ b/src/utils/SkBase64.h
@@ -1,4 +1,3 @@
-
 /*
  * Copyright 2006 The Android Open Source Project
  *
@@ -6,7 +5,6 @@
  * found in the LICENSE file.
  */
 
-
 #ifndef SkBase64_DEFINED
 #define SkBase64_DEFINED
 
@@ -30,9 +28,6 @@ public:
     */
     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);