Fix the code which causes Windows GN build warning

Fix the code which causes Windows GN build warning

The signed/unsigned comparison is causing the chromium windows GN build
broken.

Committed: https://pdfium.googlesource.com/pdfium/+/461129efe889fa7d653c8c4620a12179eeddd5ec

[Wei Li, 2016-04-12 20:55:38]

weili@chromium.org changed reviewers:
+ dsinclair@chromium.org

[Wei Li, 2016-04-12 20:55:38]

PTAL, thanks. 
@ochang, We should be able to roll after this while I am looking for a permanent
solution.

[Oliver Chang, 2016-04-12 20:59:30]

On 2016/04/12 20:55:38, Wei Li wrote:
> PTAL, thanks. 
> @ochang, We should be able to roll after this while I am looking for a
permanent
> solution.

Thanks Wei, I was actually about to upload an alternate patch here: 
https://codereview.chromium.org/1885613003/

[Oliver Chang, 2016-04-12 21:02:11]

Description was changed from

==========
Fix the code which causes Windows GN build warning

The signed/unsigned comparison is causing the chromium windows GN build
broken.
==========

to

==========
Fix the code which causes Windows GN build warning

The signed/unsigned comparison is causing the chromium windows GN build
broken.
==========

[Oliver Chang, 2016-04-12 21:02:11]

ochang@chromium.org changed reviewers:
+ tsepez@chromium.org

[Oliver Chang, 2016-04-12 21:02:19]

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

[Oliver Chang, 2016-04-12 21:02:20]

+Tom in case Dan already left for the day.

[Tom Sepez, 2016-04-12 21:06:15]

lgtm

[Oliver Chang, 2016-04-12 21:08:45]

The CQ bit was checked by ochang@chromium.org

[commit-bot: I haz the power, 2016-04-12 21:08:50]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1884773002/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1884773002/1

[commit-bot: I haz the power, 2016-04-12 21:47:49]

Description was changed from

==========
Fix the code which causes Windows GN build warning

The signed/unsigned comparison is causing the chromium windows GN build
broken.
==========

to

==========
Fix the code which causes Windows GN build warning

The signed/unsigned comparison is causing the chromium windows GN build
broken.

Committed:
https://pdfium.googlesource.com/pdfium/+/461129efe889fa7d653c8c4620a12179eedd...
==========

[commit-bot: I haz the power, 2016-04-12 21:47:50]

Committed patchset #1 (id:1) as
https://pdfium.googlesource.com/pdfium/+/461129efe889fa7d653c8c4620a12179eedd...