Move CollectionIndexCache.h from core/html/ to core/dom/.

Move CollectionIndexCache.h from core/html/ to core/dom/.

core/dom/ChildNodeList depends on it. We should put it to core/dom/ because
core/dom is a lower layer.

This CL has no behavior changes.

Committed: https://crrev.com/3cc24b58938a8357176b1ee4329a0f8b8f904628
Cr-Commit-Position: refs/heads/master@{#424467}

[tkent, 2016-10-07 00:40:43]

The CQ bit was checked by tkent@chromium.org to run a CQ dry run

[commit-bot: I haz the power, 2016-10-07 00:41:14]

Dry run: CQ is trying da patch. Follow status at
 
https://chromium-cq-status.appspot.com/v2/patch-status/codereview.chromium.or...

[commit-bot: I haz the power, 2016-10-07 02:08:00]

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

[commit-bot: I haz the power, 2016-10-07 02:08:01]

Dry run: This issue passed the CQ dry run.

[tkent, 2016-10-07 02:14:11]

tkent@chromium.org changed reviewers:
+ hayato@chromium.org

[tkent, 2016-10-07 02:14:11]

hayato@, would you review this please?

[hayato, 2016-10-11 08:29:39]

lgtm

[tkent, 2016-10-11 13:48:27]

The CQ bit was checked by tkent@chromium.org

[commit-bot: I haz the power, 2016-10-11 13:48:40]

CQ is trying da patch. Follow status at
 
https://chromium-cq-status.appspot.com/v2/patch-status/codereview.chromium.or...

[commit-bot: I haz the power, 2016-10-11 17:17:33]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2016-10-11 17:20:00]

Description was changed from

==========
Move CollectionIndexCache.h from core/html/ to core/dom/.

core/dom/ChildNodeList depends on it. We should put it to core/dom/ because
core/dom is a lower layer.

This CL has no behavior changes.
==========

to

==========
Move CollectionIndexCache.h from core/html/ to core/dom/.

core/dom/ChildNodeList depends on it. We should put it to core/dom/ because
core/dom is a lower layer.

This CL has no behavior changes.

Committed: https://crrev.com/3cc24b58938a8357176b1ee4329a0f8b8f904628
Cr-Commit-Position: refs/heads/master@{#424467}
==========

[commit-bot: I haz the power, 2016-10-11 17:20:01]

Patchset 1 (id:??) landed as
https://crrev.com/3cc24b58938a8357176b1ee4329a0f8b8f904628
Cr-Commit-Position: refs/heads/master@{#424467}