Revert of Fix typo in install-sysroot.py

Revert of Fix typo in install-sysroot.py (patchset #2 id:20001 of https://codereview.chromium.org/1317973005/ )

Reason for revert:
Caused check_licenses to fail:

https://build.chromium.org/p/chromium/builders/Linux/builds/66701

Original issue's description:
> Fix typo in install-sysroot.py
>
> install-sysroot.py was intended to default to installing
> the sysroot ia32, but within this script 'i386' is used to
> refer to this architecture.
>
> This most likely went unnoticed since the ia32 builder
> either use branding=Official, or explicitly set
> use_sysroot=1, or have a complete set of packages for
> cross building on the host system.
>
> BUG=504446
>
> Committed: https://crrev.com/1d62049b4c176fbd43bed90fc9a76273b11ad406
> Cr-Commit-Position: refs/heads/master@{#347821}

TBR=dpranke@chromium.org,sbc@chromium.org
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=504446
Committed: https://crrev.com/3b27a2de111759359162bcad49753e17ee1cf002
Cr-Commit-Position: refs/heads/master@{#347839}

[chrishtr, 2015-09-08 23:57:39]

Created Revert of Fix typo in install-sysroot.py

[commit-bot: I haz the power, 2015-09-08 23:58:00]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1315773003/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1315773003/1

[commit-bot: I haz the power, 2015-09-08 23:58:36]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-09-08 23:59:17]

Patchset 1 (id:??) landed as
https://crrev.com/3b27a2de111759359162bcad49753e17ee1cf002
Cr-Commit-Position: refs/heads/master@{#347839}

[Dirk Pranke, 2015-09-09 00:01:15]

lgtm

[Adrian Kuegel, 2015-09-09 10:27:37]

A revert of this CL (patchset #1 id:1) has been created in
https://codereview.chromium.org/1324853005/ by akuegel@chromium.org.

The reason for reverting is: The check_licenses script has been fixed, and it
cycled green:
https://build.chromium.org/p/chromium/builders/Linux/builds/66708.