Safari playback broken in 1.4

Created by: davemevans

b9a0b4d9 seems to have broken playback in Safari. Playback worked in 1.3.

Adding an additional argument to sourceBuffer.appendBuffer causes appendBuffer to throw a TypeError whenever data is appended to the sourceBuffer. Removing chunk from buffer[appendMethod] call makes Safari happy again.

I would have thought most browsers these days should be using appendBuffer so perhaps only calls to append should take a second argument?

@KozhinM ?