Revert "Implement Element.matches(selectors)"

This reverts commit 23ee357add9601e5d28329e927acbaeab0ddcd7e.

It was causing failures on linux_chromeos browser_tests, in particular
VirtualKeyboardBrowserTest.*.

BUG=326652
TBR=philipj@opera.com

Review URL: https://codereview.chromium.org/103303005

git-svn-id: svn://svn.chromium.org/blink/trunk@163457 bbb929c8-8fbe-4397-9dbb-9b2b20218538