Code cleanup: remove unnecessary casts.

Code cleanup: remove unnecessary casts.

With the three sides of the patch needed for 343327 landed, these temporary
casts are unnecessary. Removed.

BUG=343327
Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=175797

[rjkroege, 2014-06-05 17:25:38]

ptal

[dglazkov, 2014-06-06 15:21:55]

lgtm

[rjkroege, 2014-06-06 15:55:19]

The CQ bit was checked by rjkroege@chromium.org

[commit-bot: I haz the power, 2014-06-06 15:56:15]

CQ is trying da patch. Follow status at
 https://chromium-status.appspot.com/cq/rjkroege@chromium.org/313263005/1

[commit-bot: I haz the power, 2014-06-06 17:03:57]

FYI, CQ is re-trying this CL (attempt #1).
The failing builders are:
  blink_presubmit on tryserver.blink
(http://build.chromium.org/p/tryserver.blink/builders/blink_presubmit/builds/7165)
  mac_gpu on tryserver.chromium.gpu
(http://build.chromium.org/p/tryserver.chromium.gpu/builders/mac_gpu/builds/13893)

[commit-bot: I haz the power, 2014-06-06 17:06:02]

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

[commit-bot: I haz the power, 2014-06-06 17:06:03]

Try jobs failed on following builders:
  blink_presubmit on tryserver.blink
(http://build.chromium.org/p/tryserver.blink/builders/blink_presubmit/builds/7176)

[rjkroege, 2014-06-09 14:43:26]

The CQ bit was checked by rjkroege@chromium.org

[commit-bot: I haz the power, 2014-06-09 14:44:16]

CQ is trying da patch. Follow status at
 https://chromium-status.appspot.com/cq/rjkroege@chromium.org/313263005/1

[commit-bot: I haz the power, 2014-06-09 14:47:08]

Change committed as 175797