Delete RenderLayerCompositor::requiresOverhangLayers

Delete RenderLayerCompositor::requiresOverhangLayers

This function just returns whether we're the main frame.

R=jamesr@chromium.org

Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=175996

[jamesr, 2014-06-11 22:44:39]

lgtm

[abarth-chromium, 2014-06-11 22:46:58]

The CQ bit was checked by abarth@chromium.org

[commit-bot: I haz the power, 2014-06-11 22:47:13]

CQ is trying da patch. Follow status at
 https://chromium-status.appspot.com/cq/abarth@chromium.org/329423002/1

[commit-bot: I haz the power, 2014-06-11 23:45:02]

FYI, CQ is re-trying this CL (attempt #1).
The failing builders are:
  win_blink_compile_dbg on tryserver.blink
(http://build.chromium.org/p/tryserver.blink/builders/win_blink_compile_dbg/bu...)
  win_blink_rel on tryserver.blink
(http://build.chromium.org/p/tryserver.blink/builders/win_blink_rel/builds/11635)
  mac_gpu on tryserver.chromium.gpu
(http://build.chromium.org/p/tryserver.chromium.gpu/builders/mac_gpu/builds/15740)
  win_gpu on tryserver.chromium.gpu
(http://build.chromium.org/p/tryserver.chromium.gpu/builders/win_gpu/builds/18872)

[commit-bot: I haz the power, 2014-06-12 00:07:06]

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

[commit-bot: I haz the power, 2014-06-12 00:07:07]

Try jobs failed on following builders:
  mac_gpu on tryserver.chromium.gpu
(http://build.chromium.org/p/tryserver.chromium.gpu/builders/mac_gpu/builds/15785)

[abarth-chromium, 2014-06-12 03:32:20]

The CQ bit was checked by abarth@chromium.org

[commit-bot: I haz the power, 2014-06-12 03:33:03]

CQ is trying da patch. Follow status at
 https://chromium-status.appspot.com/cq/abarth@chromium.org/329423002/1

[commit-bot: I haz the power, 2014-06-12 06:16:14]

Change committed as 175996