Reland "Make EndOfSentence stop at block boundaries"

This reverts commit 148c350663e65a1fd8707251d4aaea1498266767.

Reason for reland: The original patch is not the cause of
test failure. Test still fails after the revert:

https://ci.chromium.org/p/chromium/builders/luci.chromium.ci/WebKit%20Win10/43312

Original change's description:
> Revert "Make EndOfSentence stop at block boundaries"
>
> This reverts commit aee1ee31da3be29fe241265b39ed05c45f4d49d4.
>
> Reason for revert: Suspect this CL caused https://bugs.chromium.org/p/monorail/issues/detail?id=4576
>
> Original change's description:
> > Make EndOfSentence stop at block boundaries
> >
> > This patch stops EndOfSentence from crossing block boundaries, since
> > block boundaries are also sentence boundaries.
> >
> > Bug: 778507
> > Change-Id: I19ec97de1bbaac50db4c55b38ffb158339003993
> > Reviewed-on: https://chromium-review.googlesource.com/c/1337432
> > Reviewed-by: Yoichi Osato <yoichio@chromium.org>
> > Reviewed-by: Yoshifumi Inoue <yosin@chromium.org>
> > Commit-Queue: Xiaocheng Hu <xiaochengh@chromium.org>
> > Cr-Commit-Position: refs/heads/master@{#608850}
>
> TBR=yosin@chromium.org,yoichio@chromium.org,xiaochengh@chromium.org
>
> # Not skipping CQ checks because original CL landed > 1 day ago.
>
> Bug: 778507
> Change-Id: I7d48146bd7fb27c34427f543ad3b54443ae63715
> Reviewed-on: https://chromium-review.googlesource.com/c/1340815
> Reviewed-by: Maxim Kolosovskiy <kolos@chromium.org>
> Commit-Queue: Maxim Kolosovskiy <kolos@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#609224}

TBR=yosin@chromium.org,yoichio@chromium.org,xiaochengh@chromium.org,kolos@chromium.org

# Not skipping CQ checks because original CL landed > 1 day ago.

Bug: 778507
Change-Id: If89bc2d7b9379af17dd326d92f9eb6e31d5d78f8
Reviewed-on: https://chromium-review.googlesource.com/c/1347032
Commit-Queue: Xiaocheng Hu <xiaochengh@chromium.org>
Reviewed-by: Xiaocheng Hu <xiaochengh@chromium.org>
Reviewed-by: Yoichi Osato <yoichio@chromium.org>
Cr-Commit-Position: refs/heads/master@{#610673}