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This patch also cleans up CSSSelector so that it doesn't use ShadowDOM flag.
Runtime ShadowDOM flag was already set to true at r169201. This change shouldn't have any effects.

BUG=336121

Review URL: https://codereview.chromium.org/210763002

git-svn-id: svn://svn.chromium.org/blink/trunk@170009 bbb929c8-8fbe-4397-9dbb-9b2b20218538