clang/win: Fix -Wsign-compare warning after https://codereview.chromium.org/1631903002

clang/win: Fix -Wsign-compare warning after https://codereview.chromium.org/1631903002

Also turn on chromium_code for these targets in gyp.  This makes warnings
for these targets consistent between gyp and gn.

BUG=550983, 581133, 82385
TBR=grt@chromium.org

Committed: https://crrev.com/80a9d9b6ec09e3565f3a509bf0dde3509e61e451
Cr-Commit-Position: refs/heads/master@{#371520}

[Nico, 2016-01-26 15:42:04]

The CQ bit was checked by thakis@chromium.org

[commit-bot: I haz the power, 2016-01-26 15:42:12]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1637793003/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1637793003/1

[commit-bot: I haz the power, 2016-01-26 16:03:19]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2016-01-26 16:04:16]

Description was changed from

==========
clang/win: Fix -Wsign-compare warning after
https://codereview.chromium.org/1631903002

Also turn on chromium_code for these targets in gyp.  This makes warnings
for these targets consistent between gyp and gn.

BUG=550983, 581133, 82385
TBR=grt@chromium.org
==========

to

==========
clang/win: Fix -Wsign-compare warning after
https://codereview.chromium.org/1631903002

Also turn on chromium_code for these targets in gyp.  This makes warnings
for these targets consistent between gyp and gn.

BUG=550983, 581133, 82385
TBR=grt@chromium.org

Committed: https://crrev.com/80a9d9b6ec09e3565f3a509bf0dde3509e61e451
Cr-Commit-Position: refs/heads/master@{#371520}
==========

[commit-bot: I haz the power, 2016-01-26 16:04:16]

Patchset 1 (id:??) landed as
https://crrev.com/80a9d9b6ec09e3565f3a509bf0dde3509e61e451
Cr-Commit-Position: refs/heads/master@{#371520}

[grt (UTC plus 2), 2016-01-26 16:41:15]

lgtm. thanks!