Remove unused function in PictureLayerTiling

Remove unused function in PictureLayerTiling

R=vmpstr@chromium.org
BUG=none

Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=271801

[vmpstr, 2014-05-20 00:09:52]

lgtm

[enne (OOO), 2014-05-20 16:41:23]

The CQ bit was checked by enne@chromium.org

[commit-bot: I haz the power, 2014-05-20 16:41:43]

CQ is trying da patch. Follow status at
 https://chromium-status.appspot.com/cq/enne@chromium.org/292883002/1

[commit-bot: I haz the power, 2014-05-20 18:33:25]

FYI, CQ is re-trying this CL (attempt #1).
Please consider checking whether the failures are real,
and report flakes to chrome-troopers@google.com.
The failing builders are:
  android_dbg_triggered_tests on tryserver.chromium
(http://build.chromium.org/p/tryserver.chromium/builders/android_dbg_triggered...)

[commit-bot: I haz the power, 2014-05-20 19:34:59]

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

[commit-bot: I haz the power, 2014-05-20 19:35:00]

Try jobs failed on following builders:
  android_dbg_triggered_tests on tryserver.chromium
(http://build.chromium.org/p/tryserver.chromium/builders/android_dbg_triggered...)

[enne (OOO), 2014-05-20 21:08:42]

The CQ bit was checked by enne@chromium.org

[commit-bot: I haz the power, 2014-05-20 21:10:22]

CQ is trying da patch. Follow status at
 https://chromium-status.appspot.com/cq/enne@chromium.org/292883002/1

[commit-bot: I haz the power, 2014-05-21 01:49:53]

Change committed as 271801