win: Fix current toolchain path with old packaging

win: Fix current toolchain path with old packaging

I broke boringssl's use of depot_tools toolchain as I changed the
name of the sdk path key. This happened to work in Chrome because
src/ has fallback behaviour.

Restore the 'win8sdk' name when unpacking a current/old-style
toolchain package (i.e. what everyone is still using).

TBR=dpranke@chromium.org
R=davidben@chromium.org

Committed: http://src.chromium.org/viewvc/chrome?view=rev&revision=295492

[scottmg, 2015-06-02 18:53:11]

scottmg@chromium.org changed reviewers:
+ dpranke@chromium.org

[Dirk Pranke, 2015-06-02 19:00:13]

lgtm

[scottmg, 2015-06-02 19:03:52]

The CQ bit was checked by scottmg@chromium.org to run a CQ dry run

[commit-bot: I haz the power, 2015-06-02 19:04:25]

Dry run: CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1159433006/1

[scottmg, 2015-06-02 19:04:39]

The CQ bit was unchecked by scottmg@chromium.org

[scottmg, 2015-06-02 19:04:50]

The CQ bit was checked by scottmg@chromium.org

[commit-bot: I haz the power, 2015-06-02 19:07:10]

The CQ bit was unchecked by commit-bot@chromium.org

[commit-bot: I haz the power, 2015-06-02 19:07:12]

Dry run: This issue passed the CQ dry run.

[scottmg, 2015-06-02 19:08:08]

The CQ bit was checked by scottmg@chromium.org

[commit-bot: I haz the power, 2015-06-02 19:08:50]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1159433006/1

[commit-bot: I haz the power, 2015-06-02 19:12:08]

Committed patchset #1 (id:1) as
http://src.chromium.org/viewvc/chrome?view=rev&revision=295492

[scottmg, 2015-06-02 19:37:10]

A revert of this CL (patchset #1 id:1) has been created in
https://codereview.chromium.org/1167753003/ by scottmg@chromium.org.

The reason for reverting is: Breaking chromium waterfall..