Fix RemoveFromScrollTree and RemoveFromClipTree

Fix RemoveFromScrollTree and RemoveFromClipTree

These functions should set needs commit, but didn't. This lead to stale
pointers in the impl tree.

BUG=413743, 403866
TBR=danakj@chromium.org

Review URL: https://codereview.chromium.org/572483002

Cr-Commit-Position: refs/heads/master@{#294749}
(cherry picked from commit 66133e86b6d79534605539aa684a248e6b6205bf)

Committed: https://chromium.googlesource.com/chromium/src/+/d1ea9b5a6670389019344279d5bb10bb7edfd139

[Ian Vollick, 2014-09-18 04:01:34]

The CQ bit was checked by vollick@chromium.org

[commit-bot: I haz the power, 2014-09-18 04:02:57]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patchset/572353003/1

[commit-bot: I haz the power, 2014-09-18 04:05:45]

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

[commit-bot: I haz the power, 2014-09-18 04:05:46]

Try jobs failed on following builders:
  mac_gpu on tryserver.chromium.gpu
(http://build.chromium.org/p/tryserver.chromium.gpu/builders/mac_gpu/builds/57517)
  ios_rel_device_ninja on tryserver.chromium.mac
(http://build.chromium.org/p/tryserver.chromium.mac/builders/ios_rel_device_ni...)
  mac_chromium_compile_dbg on tryserver.chromium.mac
(http://build.chromium.org/p/tryserver.chromium.mac/builders/mac_chromium_comp...)
  mac_chromium_rel_swarming on tryserver.chromium.mac
(http://build.chromium.org/p/tryserver.chromium.mac/builders/mac_chromium_rel_...)
  win8_chromium_rel on tryserver.chromium.win
(http://build.chromium.org/p/tryserver.chromium.win/builders/win8_chromium_rel...)

[Ian Vollick, 2014-09-18 04:07:05]

The CQ bit was unchecked by vollick@chromium.org

[Ian Vollick, 2014-09-18 04:08:24]

Committed patchset #1 (id:1) manually as d1ea9b5 (presubmit successful).