Remove WebPopupMenuImpl::enterForceCompositingMode

Remove WebPopupMenuImpl::enterForceCompositingMode

Create the compositor in WebPopupMenuImpl::initialize because it's always going to be used.

BUG=378029
Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=175160

[ojan, 2014-05-30 00:43:20]

lgtm

Nice!

[commit-bot: I haz the power, 2014-05-30 00:44:01]

CQ is trying da patch. Follow status at
 https://chromium-status.appspot.com/cq/jbauman@chromium.org/304273002/1

[commit-bot: I haz the power, 2014-05-30 01:57:45]

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

[commit-bot: I haz the power, 2014-05-30 08:47:59]

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

[commit-bot: I haz the power, 2014-05-30 08:48:00]

Try jobs failed on following builders:
  mac_blink_rel on tryserver.blink
(http://build.chromium.org/p/tryserver.blink/builders/mac_blink_rel/builds/9556)

[jbauman, 2014-05-30 18:26:45]

The CQ bit was checked by jbauman@chromium.org

[commit-bot: I haz the power, 2014-05-30 18:27:44]

CQ is trying da patch. Follow status at
 https://chromium-status.appspot.com/cq/jbauman@chromium.org/304273002/1

[commit-bot: I haz the power, 2014-05-30 22:43:15]

Change committed as 175160