Interface android.net.http.BidirectionalStream.Callback

Changed from a class to an interface.

Removed Constructors
BidirectionalStream.Callback()  
 

Changed Methods
void onCanceled(BidirectionalStream, UrlResponseInfo) Changed from non-abstract to abstract.  
void onResponseTrailersReceived(BidirectionalStream, UrlResponseInfo, HeaderBlock) Change in signature from (android.net.http.BidirectionalStream, android.net.http.UrlResponseInfo, android.net.http.UrlResponseInfo.HeaderBlock) to (android.net.http.BidirectionalStream, android.net.http.UrlResponseInfo, android.net.http.HeaderBlock).
Changed from non-abstract to abstract.