[CSS Grid Layout] Update named grid lines syntax to the last version of the specs

Names for grid lines are now specified as a list of whitespace separated
idents enclosed in parentheses instead of as a list of strings.

BUG=282452

Review URL: https://codereview.chromium.org/23528004

git-svn-id: svn://svn.chromium.org/blink/trunk@162555 bbb929c8-8fbe-4397-9dbb-9b2b20218538
Don't expose :unresolved if Custom Elements is not enabled.

BUG=322150
TEST=:not(:unresolved) does not match anything w/ Custom Elements disabled

Review URL: https://codereview.chromium.org/82673002

git-svn-id: svn://svn.chromium.org/blink/trunk@162556 bbb929c8-8fbe-4397-9dbb-9b2b20218538
Additional timeout expectations for threaded animations tests.

These two additional tests are flakey on Win.

TBR=
BUG=248938

Review URL: https://codereview.chromium.org/83933002

git-svn-id: svn://svn.chromium.org/blink/trunk@162557 bbb929c8-8fbe-4397-9dbb-9b2b20218538
Verify that default Web Notification values are properly set.

This addresses Andrew's review comments from patch 66133003. The Web
observable change this CL introduces is that notification.dir now
defaults to "auto" rather than an empty string.

BUG=318746

Review URL: https://codereview.chromium.org/69083003

git-svn-id: svn://svn.chromium.org/blink/trunk@162558 bbb929c8-8fbe-4397-9dbb-9b2b20218538
Have the HTMLSelectElement setter throw TypeError.

If an argument that fails to convert to 'HTMLOptionElement?' is passed
to the option setter/remover on HTMLSelectElement, throw TypeError.

This follows WebIDL and Gecko. Other implementations don't throw, but
ignore such operations.

R=
BUG=270033

Review URL: https://codereview.chromium.org/83743002

git-svn-id: svn://svn.chromium.org/blink/trunk@162559 bbb929c8-8fbe-4397-9dbb-9b2b20218538