Disable stretch-to-viewport quirk for multicol.

Disable stretch-to-viewport quirk for multicol.

We don't want to stretch the height of BODY to that of the viewport if BODY is
inside a multicol container. There should be no need for this quirk in
multicol, and even if we had wanted to do something like that, what used to be
there was utterly wrong, since we'd end up with the viewport height divided by
the number of columns, which is just unpredictable silliness that nobody wants.

Un-inline the quirks mode part of stretchesToViewport() into
stretchesToViewportInQuirksMode() and check the condition that's most unlikely
to be true first, so that we can bail early.

R=leviw@chromium.org

Committed: https://crrev.com/7ae3919e47ed6b92e1c7c4fc10e58f16a7742f2e
Cr-Commit-Position: refs/heads/master@{#360388}

[leviw_travelin_and_unemployed, 2015-11-18 18:38:11]

The CQ bit was checked by leviw@chromium.org

[leviw_travelin_and_unemployed, 2015-11-18 18:38:11]

lgtm

I like the patch, but I don't agree with your assertion that no one wants
unpredictable silliness.

[commit-bot: I haz the power, 2015-11-18 18:39:39]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1461623002/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1461623002/1

[commit-bot: I haz the power, 2015-11-18 19:41:38]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-11-18 19:43:06]

Patchset 1 (id:??) landed as
https://crrev.com/7ae3919e47ed6b92e1c7c4fc10e58f16a7742f2e
Cr-Commit-Position: refs/heads/master@{#360388}