Uptake WebKit Changeset r149185.

Uptake WebKit Changeset r149185.

Object elements have the tendency to modify or even fully remove
the containing Document inside beforeload callback. While Document is removed,
RenderArena gets destroyed. Retained RenderWidgets fails to function with NULL arena.
Protect RendereArena from getting wiped out, when Document is removed
during FrameView::updateWidget().
BUG=226696
Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=152086

[eseidel, 2013-06-08 20:22:38]

I don't really like this change, but I agree it's safe.

[eseidel, 2013-06-08 20:23:23]

lgtm

As in, I agree it fixes the bug.  Just don't like the idea of using RefCounted
to patch over this.

[eseidel, 2013-06-08 20:23:23]

lgtm

lgtm

As in, I agree it fixes the bug.  Just don't like the idea of using RefCounted
to patch over this.

[commit-bot: I haz the power, 2013-06-08 20:23:34]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/inferno@chromium.org/16695002/5001

[commit-bot: I haz the power, 2013-06-08 21:12:42]

Retried try job too often on linux_layout_rel for step(s) webkit_tests
http://build.chromium.org/p/tryserver.chromium/buildstatus?builder=linux_layo...

[inferno, 2013-06-08 22:23:57]

On 2013/06/08 21:12:42, I haz the power (commit-bot) wrote:
> Retried try job too often on linux_layout_rel for step(s) webkit_tests
>
http://build.chromium.org/p/tryserver.chromium/buildstatus?builder=linux_layo...

have to refetch renderview and axobjectcache to prevent crashes, just like in
the original fix.
https://codereview.chromium.org/14329005

[commit-bot: I haz the power, 2013-06-08 22:57:49]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/inferno@chromium.org/16695002/13001

[commit-bot: I haz the power, 2013-06-08 23:50:22]

Retried try job too often on linux_layout_rel for step(s) webkit_tests
http://build.chromium.org/p/tryserver.chromium/buildstatus?builder=linux_layo...

[commit-bot: I haz the power, 2013-06-09 03:33:27]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/inferno@chromium.org/16695002/13001

[commit-bot: I haz the power, 2013-06-09 04:23:11]

Retried try job too often on linux_layout_rel for step(s) webkit_tests
http://build.chromium.org/p/tryserver.chromium/buildstatus?builder=linux_layo...

[commit-bot: I haz the power, 2013-06-09 15:16:25]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/inferno@chromium.org/16695002/13001

[commit-bot: I haz the power, 2013-06-09 17:14:39]

Change committed as 152086