Revert of Combine 'pssh' parsing routines.

Revert of Combine 'pssh' parsing routines. (patchset #8 id:140001 of https://codereview.chromium.org/1149023002/)

Reason for revert:
Breaks compile on 'Google Chrome Win' bot:
https://build.chromium.org/p/chromium.chrome/builders/Google%20Chrome%20Win/builds/1066

Original issue's description:
> Combine CENC 'pssh' box parsing routines.
>
> Also update the routines to ignore 'pssh' boxes with version 2 or
> later.
>
> BUG=460359, 460360
> TEST=new unittests pass
>
> Committed: https://crrev.com/b666d7874efac44b359a95329f0cb890e97671df
> Cr-Commit-Position: refs/heads/master@{#333556}
>
> Committed: https://crrev.com/7a84443597e92a03f90806712f8629df40bf408e
> Cr-Commit-Position: refs/heads/master@{#333611}

TBR=sandersd@chromium.org,ddorwin@chromium.org,xhwang@chromium.org,jrummell@chromium.org
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=460359, 460360
Committed: https://crrev.com/74f559c2c8d23115ad7e3c4f9335230edd155546
Cr-Commit-Position: refs/heads/master@{#333694}

[kjellander (google.com), 2015-06-10 07:21:20]

Created Revert of Combine 'pssh' parsing routines.

[commit-bot: I haz the power, 2015-06-10 07:21:39]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1165313003/1

[commit-bot: I haz the power, 2015-06-10 07:22:39]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-06-10 07:23:31]

Patchset 1 (id:??) landed as
https://crrev.com/74f559c2c8d23115ad7e3c4f9335230edd155546
Cr-Commit-Position: refs/heads/master@{#333694}