text-box-trim: remove inline box tests (tentatively)

The specification is not updated yet, and it is not that clear to us
which edges could be cut in these cases.
Since we do not plan to implement the text-line-edge? property for
now, I'd like to remove these tests to avoid confusion.

Bug: 40254880
Change-Id: I08af3d3806e4e49a9e46de0f85271fb995259bbf
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5360144


Commit-Queue: Lingqi Chi <lingqi@chromium.org>
Reviewed-by: Koji Ishii <kojii@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1271417}