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ShapingLineBreaker handles trailing spaces at the end of
wrapped lines. But when the line ends with hard break or at
the end of a block, NGLineBreaker needs to remove the
trailing spaces.

When the trailing space is not safe-to-break; e.g., the font
has kerning pairs between the last non-space character and
the trailing spaces, this patch ensures that the line width
is correct by reshaping the end.

Not doing so caused min-content and max-content differ when
there are no break opportunities, because trailing spaces for
min-content is handled by ShapingLineBreaker while for max-
content is handled by NGLineBreaker.

Bug: 636993
Cq-Include-Trybots: luci.chromium.try:linux_layout_tests_layout_ng
Change-Id: If8c810b7e4cfccfd7a35f6dd48d15ce67b98c036
Reviewed-on: https://chromium-review.googlesource.com/1111749
Commit-Queue: Emil A Eklund <eae@chromium.org>
Reviewed-by: Emil A Eklund <eae@chromium.org>
Cr-Commit-Position: refs/heads/master@{#570061}