Remove comment about issue 368416

Remove comment about issue 368416

Since the issue was opened, the validity of removing
RenderObject::positionFromPaintInvalidationContainer
was questioned and it was determined that it's
probably not such a good idea anyway.

BUG=368416
Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=179078

[dsinclair, 2014-07-28 19:34:35]

lgtm

[commit-bot: I haz the power, 2014-07-28 19:35:30]

CQ is trying da patch. Follow status at
 https://chromium-status.appspot.com/cq/jchaffraix@chromium.org/423943002/1

[commit-bot: I haz the power, 2014-07-28 20:40:36]

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...)
  linux_gpu_triggered_tests on tryserver.chromium.gpu
(http://build.chromium.org/p/tryserver.chromium.gpu/builders/linux_gpu_trigger...)
  mac_gpu on tryserver.chromium.gpu
(http://build.chromium.org/p/tryserver.chromium.gpu/builders/mac_gpu/builds/34216)
  win_gpu_triggered_tests on tryserver.chromium.gpu
(http://build.chromium.org/p/tryserver.chromium.gpu/builders/win_gpu_triggered...)

[commit-bot: I haz the power, 2014-07-28 20:53:40]

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

[commit-bot: I haz the power, 2014-07-28 20:53:41]

Try jobs failed on following builders:
  linux_gpu_triggered_tests on tryserver.chromium.gpu
(http://build.chromium.org/p/tryserver.chromium.gpu/builders/linux_gpu_trigger...)

[Julien - ping for review, 2014-07-29 00:54:39]

The CQ bit was checked by jchaffraix@chromium.org

[commit-bot: I haz the power, 2014-07-29 00:55:16]

CQ is trying da patch. Follow status at
 https://chromium-status.appspot.com/cq/jchaffraix@chromium.org/423943002/1

[commit-bot: I haz the power, 2014-07-29 00:56:07]

Change committed as 179078