Fix win64 warnings.

Fix win64 warnings.

TBR=joshualitt@google.com

NOTREECHECKS=true

Committed: https://skia.googlesource.com/skia/+/81aca547caeb6d2a526e474eb7e49f234628966e

[bsalomon, 2015-01-29 14:57:16]

bsalomon@google.com changed reviewers:
+ joshualitt@google.com

[bsalomon, 2015-01-29 14:57:20]

The CQ bit was checked by bsalomon@google.com

[commit-bot: I haz the power, 2015-01-29 14:57:36]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/884253004/1

[commit-bot: I haz the power, 2015-01-29 15:00:56]

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

[commit-bot: I haz the power, 2015-01-29 15:00:57]

Try jobs failed on following builders:
  Build-Win-VS2013-x86-Debug-Trybot on client.skia.compile
(http://build.chromium.org/p/client.skia.compile/builders/Build-Win-VS2013-x86...)

[bsalomon, 2015-01-29 15:07:24]

The CQ bit was checked by bsalomon@google.com

[commit-bot: I haz the power, 2015-01-29 15:07:36]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/884253004/20001

[commit-bot: I haz the power, 2015-01-29 15:13:26]

Committed patchset #2 (id:20001) as
https://skia.googlesource.com/skia/+/81aca547caeb6d2a526e474eb7e49f234628966e

[joshualitt, 2015-01-29 15:17:41]

On 2015/01/29 15:13:26, I haz the power (commit-bot) wrote:
> Committed patchset #2 (id:20001) as
> https://skia.googlesource.com/skia/+/81aca547caeb6d2a526e474eb7e49f234628966e

lgtm