Revert of mini_installer: Change to use _countof rather than base's arraysize macro.

Revert of mini_installer: Change to use _countof rather than base's arraysize macro. (patchset #3 id:40001 of https://codereview.chromium.org/1126163003/)

Reason for revert:
Broke signing build.

Original issue's description:
> Replace mini_installer's use of arraysize macro with range-based for loops
> and/or _countof.
>
> * Remove the duplication in the decompress.h
>
> https://msdn.microsoft.com/en-us/library/ms175773.aspx
>
> This issue arised when doing https://codereview.chromium.org/1115993004/.
>
> BUG=None
> TEST=trybots
> R=grt@chromium.org
>
> Committed: https://crrev.com/016d71e2e048f0578e2c53c3f741755173ef8cb2
> Cr-Commit-Position: refs/heads/master@{#328623}

TBR=tfarina@chromium.org
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=None

Committed: https://crrev.com/4febac2867bb9dd87b033bdd1b059888c6faa9eb
Cr-Commit-Position: refs/heads/master@{#328753}

[grt (UTC plus 2), 2015-05-07 13:28:14]

Created Revert of mini_installer: Change to use _countof rather than base's
arraysize macro.

[commit-bot: I haz the power, 2015-05-07 13:28:41]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1133613002/1

[commit-bot: I haz the power, 2015-05-07 13:30:12]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-05-07 13:31:15]

Patchset 1 (id:??) landed as
https://crrev.com/4febac2867bb9dd87b033bdd1b059888c6faa9eb
Cr-Commit-Position: refs/heads/master@{#328753}