Use invalidation sets for visited link updates.

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
Committed: https://crrev.com/038590ac56052630a62d61c43a54e9dcf1748da8
Cr-Commit-Position: refs/heads/master@{#361121}

[rune, 2015-11-20 10:19:31]

The CQ bit was checked by rune@opera.com to run a CQ dry run

[commit-bot: I haz the power, 2015-11-20 10:19:46]

Dry run: CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1459063004/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1459063004/1

[rune, 2015-11-20 10:27:46]

I wrote a webkit_unit_test, but it didn't work because the Platform object
always return 0 for LinkHash. I would need to use a Platform object wrapper that
implements some link hashing scheme to test this properly.

[commit-bot: I haz the power, 2015-11-20 11:41:25]

The CQ bit was unchecked by commit-bot@chromium.org

[commit-bot: I haz the power, 2015-11-20 11:41:25]

Dry run: This issue passed the CQ dry run.

[tkent, 2015-11-23 14:41:48]

lgtm

[rune, 2015-11-23 14:48:55]

The CQ bit was checked by rune@opera.com

[commit-bot: I haz the power, 2015-11-23 14:49:05]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1459063004/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1459063004/1

[commit-bot: I haz the power, 2015-11-23 16:26:56]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-11-23 16:27:45]

Patchset 1 (id:??) landed as
https://crrev.com/038590ac56052630a62d61c43a54e9dcf1748da8
Cr-Commit-Position: refs/heads/master@{#361121}