Revert of Enable display list 2D canvas by default

Revert of Enable display list 2D canvas by default (patchset #1 id:1 of https://codereview.chromium.org/818443002/)

Reason for revert:
WebKit XP bot has lots of LayoutTest failures and crashes in virtual/display_list_2d_canvas and virtual/gpu/fast/canvas.

See eg:
http://build.chromium.org/p/chromium.webkit/builders/WebKit%20XP/builds/16116

The commit log suggests --dump-render-tree is
not affected by this change, but I don't see
another likely culprit (unless https://src.chromium.org/viewvc/blink?view=rev&revision=187932)

The failures started on:
http://build.chromium.org/p/chromium.webkit/builders/WebKit%20XP/builds/16113

Chrome revision range:
https://chromium.googlesource.com/chromium/src/+log/5b35ed504ba27664bc0b7d7320f2ebdf610decdc..3a5e72899629e0c8d254109707e747742686fbca

Blink revision range:
http://build.chromium.org/f/chromium/perf/dashboard/ui/changelog_blink.html?url=%2Ftrunk&range=187921%3A187936&mode=html

Original issue's description:
> Enable display list 2D canvas by default
>
> With this change, display list 2D canvas will become enabled by
> default in Chrome. Content shell with --dump-render-tree will
> continue to have display lists disabled by default.
> Currently, having display lists enabled in blink means
> that display lists will be used whenever 2d canvases would
> not be GPU-accelerated.
>
> BUG=386601
>
> Committed: https://crrev.com/1546f423005338aac5961415bbfc48c61dc183ae
> Cr-Commit-Position: refs/heads/master@{#309453}

TBR=avi@chromium.org,junov@chromium.org
NOTREECHECKS=true
NOTRY=true
BUG=386601
Committed: https://crrev.com/b314d341e5c60c03aa118e96318d54a84f00b053
Cr-Commit-Position: refs/heads/master@{#310252}

[falken, 2015-01-07 08:36:17]

Created Revert of Enable display list 2D canvas by default

[commit-bot: I haz the power, 2015-01-07 08:36:26]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/832083003/1

[commit-bot: I haz the power, 2015-01-07 08:37:15]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-01-07 08:38:17]

Patchset 1 (id:??) landed as
https://crrev.com/b314d341e5c60c03aa118e96318d54a84f00b053
Cr-Commit-Position: refs/heads/master@{#310252}

[falken, 2015-01-07 10:55:44]

A revert of this CL (patchset #1 id:1) has been created in
https://codereview.chromium.org/837123003/ by falken@chromium.org.

The reason for reverting is: Reverting did not solve the Win XP failures..