Use invalidation sets for visited link updates.

We did use invalidation sets when adding/removing href from an anchor tag,
while the code that notifies that the visited state of a given url has
changed, use SubtreeStyleChange. This change gets rid of SubtreeStyleChange
which relies on sibling tree recalcs.

R=tkent@chromium.org
BUG=557440

Review URL: https://codereview.chromium.org/1459063004

Cr-Commit-Position: refs/heads/master@{#361121}
1 file changed