Revert of Revert of [Reland] Setup LayoutMenuList to not modify layout tree outside style recalc. (…

Revert of Revert of [Reland] Setup LayoutMenuList to not modify layout tree outside style recalc. (patchset #1 id:1 of https://codereview.chromium.org/1150303003/) Reason for revert: The revert didn't resolve the problem.

> Revert of [Reland] Setup LayoutMenuList to not modify layout tree outside style recalc. (patchset #1 id:1 of https://codereview.chromium.org/1150303003/)
>
> Reason for revert:
> Broke the following tests on Mac:
> AutomationApiTest.Mixins
> BrowserTest.CancelBeforeUnloadResetsURL
> NaClBrowserTestPnacl.PnaclExceptionHandlingDisabled
> PasswordManagerBrowserTest.NoPromptForFailedLoginFromSubFrameWithMultiFramesInPage
>
> Original issue's description:
> > [Reland] Setup LayoutMenuList to not modify layout tree outside style recalc.
> >
> > This CL updates the LayoutMenuList code to not modify the layout
> > tree ourside of style recalc. The way this is done is, instead of creating
> > and destroying LayoutText or LayoutBR elements it just uses
> > LayoutText elements and sets the blank string into them when
> > it would have used LayoutBR previously.
> >
> > This CL was originally landed in r195671 but was reverted in r195695 due to
> > breaking Android accessiblity tests during the blink roll. The two broken tests
> > were:
> >  * DumpAccessibilityTreeTest.AccessibilityOptgroup
> >  * DumpAccessibilityTreeTest.AccessibilitySelect
> >
> > Those tests have been marked as skip, needs rebaseline in
> > https://crrev.com/20d41b01d06a8420829a9406eaee773e11239c78
> > so this should be safe to reland.
> >
> > BUG=370462
TBR=dsinclair@chromium.org
BUG=370462
Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=195854

[tkent, 2015-05-25 08:08:44]

The CQ bit was checked by tkent@chromium.org

[commit-bot: I haz the power, 2015-05-25 08:08:47]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1152223003/1

[commit-bot: I haz the power, 2015-05-25 10:01:07]

Committed patchset #1 (id:1) as
https://src.chromium.org/viewvc/blink?view=rev&revision=195854