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The original patch caused buildbot failures because it didn't rebaseline
the newly added wpt innerText getter tests. This is fixed in this one.

Original change's description:
> Stop TextIterator from emit double newlines after H4~6 elements
>
> TextIterator currently may add two consecutive newlines after an
> H4, H5 or H6 element, while the spec of innerText doesn't have
> this case at all.
>
> This patch removes the extra newline to make TextIterator more
> spec-complicant.
>
> Note: TextIterator should eventually remove double newline emission
> also for H1~3. This patch removes it only for H4~6 to keep the
> amount of rebaselined tests small.
>
> Bug: 752672,758816
> Change-Id: I32583c194a829f52411555125e77590e36ccf838
> Cq-Include-Trybots: master.tryserver.chromium.linux:linux_layout_tests_layout_ng
> Reviewed-on: https://chromium-review.googlesource.com/661937
> Reviewed-by: Yoshifumi Inoue <yosin@chromium.org>
> Reviewed-by: Koji Ishii <kojii@chromium.org>
> Commit-Queue: Xiaocheng Hu <xiaochengh@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#501297}

TBR=yosin@chromium.org,kojii@chromium.org,xiaochengh@chromium.org,simonp@opera.com

Bug: 752672,758816
Change-Id: I9f6414635d257a309eca0f7f28882c7ebdc90e94
Reviewed-on: https://chromium-review.googlesource.com/664122
Commit-Queue: Xiaocheng Hu <xiaochengh@chromium.org>
Reviewed-by: Xiaocheng Hu <xiaochengh@chromium.org>
Cr-Commit-Position: refs/heads/master@{#501563}