Revert of Pass initDataType instead of contentType on OnNeedKey(). (patchset #4 id:60001 of https://codereview.chromium.org/
611513005/)
Reason for revert:
This broke media/encrypted-media/encrypted-media-needkey.html on Linux (at least)
Original issue's description:
> Pass initDataType instead of contentType to OnNeedKey().
>
> BUG=224786
>
> Committed: https://crrev.com/
2983dc91cc0bc7be6014f4bfc5cb19cc6e262a0b
> Cr-Commit-Position: refs/heads/master@{#297523}
TBR=ddorwin@chromium.org,sandersd@chromium.org
NOTREECHECKS=true
NOTRY=true
BUG=224786
Review URL: https://codereview.chromium.org/
616183002
Cr-Commit-Position: refs/heads/master@{#297538}