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This patch chagnes |ComputeNGLocal{Caret,Selection}Rect()| to utilize
|NGInlineCursor| instead of |NGPaintFragment| for prepration of migrating
|NGFragmentItem|.

Bug: 982194
Change-Id: I040c946dd405237e145af4702669304eecfe34ec
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1877505
Commit-Queue: Yoshifumi Inoue <yosin@chromium.org>
Reviewed-by: Koji Ishii <kojii@chromium.org>
Cr-Commit-Position: refs/heads/master@{#709828}