Use UintToString rather than IntToString in version.cc

Use UintToString rather than IntToString in version.cc

Version components are unsigned integers, so UintToString() is the
appropriate conversion function to use.

BUG=505479
TEST=base_unittests

Committed: https://crrev.com/0dd50573aeaf8a7c93da361e9049cde7efb7c6a3
Cr-Commit-Position: refs/heads/master@{#340523}

[Adam Rice, 2015-07-03 11:54:36]

ricea@chromium.org changed reviewers:
+ thakis@chromium.org

[Adam Rice, 2015-07-24 14:04:34]

-Nico (hiding)
+rvargas for OWNERS.

[Adam Rice, 2015-07-24 14:05:02]

ricea@chromium.org changed reviewers:
+ rvargas@chromium.org
- thakis@chromium.org

[Adam Rice, 2015-07-24 14:05:03]

-Nico (hiding)
+rvargas for OWNERS.

For real this time.

[rvargas (doing something else), 2015-07-24 21:56:10]

lgtm

[Adam Rice, 2015-07-24 21:58:16]

The CQ bit was checked by ricea@chromium.org

[commit-bot: I haz the power, 2015-07-24 21:58:25]

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

[commit-bot: I haz the power, 2015-07-24 21:58:26]

This CL has an open dependency (Issue 1212653005 Patch 1). Please resolve the
dependency and try again.

[Adam Rice, 2015-07-27 18:01:03]

The CQ bit was checked by ricea@chromium.org

[commit-bot: I haz the power, 2015-07-27 18:02:37]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1208983003/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1208983003/1

[commit-bot: I haz the power, 2015-07-27 19:09:32]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-07-27 19:10:48]

Patchset 1 (id:??) landed as
https://crrev.com/0dd50573aeaf8a7c93da361e9049cde7efb7c6a3
Cr-Commit-Position: refs/heads/master@{#340523}