Avoid using floating point when not needed.

Avoid using floating point when not needed.

Caused inaccuracies which made us think that we had one column more than we
actually had, which in turn triggered an assertion failure.

BUG=504158
R=dsinclair@chromium.org

Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=198213

[szager1, 2015-07-01 16:03:57]

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

[szager1, 2015-07-01 16:03:57]

There's still an implicit type conversion of the return value to unsigned int. 
You should probably do an explicit (round|floor|ceil).

[mstensho (USE GERRIT), 2015-07-02 07:53:57]

On 2015/07/01 16:03:57, szager1 wrote:
> There's still an implicit type conversion of the return value to unsigned int.

> You should probably do an explicit (round|floor|ceil).

Done.

[dsinclair, 2015-07-02 13:54:52]

lgtm

[mstensho (USE GERRIT), 2015-07-02 14:01:42]

The CQ bit was checked by mstensho@opera.com

[commit-bot: I haz the power, 2015-07-02 14:02:00]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1216223004/20001

[commit-bot: I haz the power, 2015-07-02 14:05:10]

Committed patchset #2 (id:20001) as
https://src.chromium.org/viewvc/blink?view=rev&revision=198213