Simplify some shadow crossing logic in SelectorQuery.cpp

Simplify some shadow crossing logic in SelectorQuery.cpp

ElementTraversal::firstWithin is the same as doing
::next(rootNode, &rootNode) we can just do that here. We can also use
isOpenOrV0() to remove some verbose checks, and finally we don't need to
check isShadowHost (which contains a bunch of duplciate checks) and can
just null check ::shadow() which is equivalent.

BUG=703900
Review-Url: https://codereview.chromium.org/2782483004
Cr-Commit-Position: refs/heads/master@{#460544}
Committed: https://chromium.googlesource.com/chromium/src/+/ab0448c6ce0471b98a8a7538a1a07377e41ff0bd

[esprehn, 2017-03-29 00:23:07]

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

[commit-bot: I haz the power, 2017-03-29 00:23:50]

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, 2017-03-29 00:33:58]

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

[commit-bot: I haz the power, 2017-03-29 00:33:58]

Dry run: Try jobs failed on following builders:
  win_chromium_rel_ng on master.tryserver.chromium.win (JOB_FAILED,
http://build.chromium.org/p/tryserver.chromium.win/builders/win_chromium_rel_...)

[esprehn, 2017-03-29 02:33:37]

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

[commit-bot: I haz the power, 2017-03-29 02:34:21]

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, 2017-03-29 04:05:06]

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

[commit-bot: I haz the power, 2017-03-29 04:05:06]

Dry run: This issue passed the CQ dry run.

[esprehn, 2017-03-29 17:47:28]

esprehn@chromium.org changed reviewers:
+ dglazkov@chromium.org, meade@chromium.org, rune@opera.com

[rune, 2017-03-29 20:59:37]

lgtm

[esprehn, 2017-03-29 21:40:44]

The CQ bit was checked by esprehn@chromium.org

[commit-bot: I haz the power, 2017-03-29 21:41:46]

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, 2017-03-29 21:49:18]

CQ is committing da patch.

Bot data: {"patchset_id": 1, "attempt_start_ts": 1490823644152010, "parent_rev":
"78f5d7d5bae564e75a5bc7fb2f65a1e67ff9547c", "commit_rev":
"ab0448c6ce0471b98a8a7538a1a07377e41ff0bd"}

[commit-bot: I haz the power, 2017-03-29 21:50:05]

Description was changed from

==========
Simplify some shadow crossing logic in SelectorQuery.cpp

ElementTraversal::firstWithin is the same as doing
::next(rootNode, &rootNode) we can just do that here. We can also use
isOpenOrV0() to remove some verbose checks, and finally we don't need to
check isShadowHost (which contains a bunch of duplciate checks) and can
just null check ::shadow() which is equivalent.

BUG=703900
==========

to

==========
Simplify some shadow crossing logic in SelectorQuery.cpp

ElementTraversal::firstWithin is the same as doing
::next(rootNode, &rootNode) we can just do that here. We can also use
isOpenOrV0() to remove some verbose checks, and finally we don't need to
check isShadowHost (which contains a bunch of duplciate checks) and can
just null check ::shadow() which is equivalent.

BUG=703900

Review-Url: https://codereview.chromium.org/2782483004
Cr-Commit-Position: refs/heads/master@{#460544}
Committed:
https://chromium.googlesource.com/chromium/src/+/ab0448c6ce0471b98a8a7538a1a0...
==========

[commit-bot: I haz the power, 2017-03-29 21:50:06]

Committed patchset #1 (id:1) as
https://chromium.googlesource.com/chromium/src/+/ab0448c6ce0471b98a8a7538a1a0...