Make SkStream *not* ref counted.

include/utils/mac/SkCGUtils.h

Index: include/utils/mac/SkCGUtils.h
diff --git a/include/utils/mac/SkCGUtils.h b/include/utils/mac/SkCGUtils.h
index a0fe666d2c29d4443f96a1d24aa9578b1d821f0c..7ac0431b25f0066e2da17b9287868687e9b59456 100644
--- a/include/utils/mac/SkCGUtils.h
+++ b/include/utils/mac/SkCGUtils.h
@@ -62,20 +62,17 @@ static inline CGImageRef SkCreateCGImageRef(const SkBitmap& bm) {
  */
 void SkCGDrawBitmap(CGContextRef, const SkBitmap&, float x, float y);
 
+/**
+ *  Create an SkBitmap drawing of the encoded PDF document, returning true on
+ *  success. Deletes the stream when finished.
+ */
 bool SkPDFDocumentToBitmap(SkStream* stream, SkBitmap* output);
 
 /**
- *  Return a provider that wraps the specified stream. It will become an
- *  owner of the stream, so the caller must still manage its ownership.
- *
- *  To hand-off ownership of the stream to the provider, the caller must do
- *  something like the following:
- *
- *  SkStream* stream = new ...;
- *  CGDataProviderRef provider = SkStreamToDataProvider(stream);
- *  stream->unref();
+ *  Return a provider that wraps the specified stream. It will become the only
+ *  owner of the stream, so the caller must stop referring to the stream.
  *
- *  Now when the provider is finally deleted, it will delete the stream.
+ *  When the provider is finally deleted, it will delete the stream.
  */
 CGDataProviderRef SkCreateDataProviderFromStream(SkStream*);