Fix signed/unsigned compare in messages.cc

Fix signed/unsigned compare in messages.cc

R=machenbach@chromium.org
NOTREECHECKS=true
NOTRY=true

Committed: https://crrev.com/2e0cf57804ab803a0af6059c8f74926d10af505b
Cr-Commit-Position: refs/heads/master@{#27865}

[Michael Achenbach, 2015-04-16 07:46:30]

lgtm

[Michael Achenbach, 2015-04-16 07:58:09]

The CQ bit was checked by machenbach@chromium.org

[commit-bot: I haz the power, 2015-04-16 07:58:15]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1089363002/1

[commit-bot: I haz the power, 2015-04-16 07:59:44]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-04-16 08:00:00]

Patchset 1 (id:??) landed as
https://crrev.com/2e0cf57804ab803a0af6059c8f74926d10af505b
Cr-Commit-Position: refs/heads/master@{#27865}

[Sven Panne, 2015-04-16 10:05:58]

svenpanne@chromium.org changed reviewers:
+ svenpanne@chromium.org

[Sven Panne, 2015-04-16 10:05:59]

DBN (drive-by nit ;-)

https://codereview.chromium.org/1089363002/diff/1/src/messages.cc
File src/messages.cc (right):

https://codereview.chromium.org/1089363002/diff/1/src/messages.cc#newcode188
src/messages.cc:188: unsigned int i = 0;
Actually, this should be size_t...