https://codereview.chromium.org/2777063007/

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/76f8029bef50611fdddf565925b9420bdac05021

commit 76f8029bef50611fdddf565925b9420bdac05021
Author: rune <rune@opera.com>
Date: Wed Mar 29 11:42:47 2017

Corrected specificity for :not for default @namespace.

The argument to :not() consists of a universal, type, or a simple
selector. However, we prepend an implicit universal selector with the
default namespace URI to all compound selectors to correctly match only
elements in the default namespace. That is not necessary for compounds
inside pseudo argument lists, but we do in those cases as well.

When calculating the specificity for :not(), we assume its argument
consists of a single simple selectors, but in the case where we have a
default namespace, a namespaced universal selector is prepended. We
only added the specificity for the universal selector in that case.
Instead, walk all sub-selectors of the :not() compound when calculating
the specificity.

R=meade@chromium.org
BUG= 706206 

Review-Url: https://codereview.chromium.org/2777063007
Cr-Commit-Position: refs/heads/master@{#460355}

[add] https://crrev.com/76f8029bef50611fdddf565925b9420bdac05021/third_party/WebKit/LayoutTests/fast/css/specificity-not-and-default-ns.html
[modify] https://crrev.com/76f8029bef50611fdddf565925b9420bdac05021/third_party/WebKit/Source/core/css/CSSSelector.cpp
[modify] https://crrev.com/76f8029bef50611fdddf565925b9420bdac05021/third_party/WebKit/Source/core/css/parser/CSSSelectorParser.cpp