Revert "DevTools: matched styles respect :visited/:link pseudo classes"

This reverts commit r174963.
Reason for revert: the patch regressed ::content selectors for distributed
nodes in shadow DOM.

BUG=380414,356999
TBR=vsevik
NOTRY=true

Review URL: https://codereview.chromium.org/311123002

git-svn-id: svn://svn.chromium.org/blink/trunk@175487 bbb929c8-8fbe-4397-9dbb-9b2b20218538