[LayoutNG] Remove unreachable if-stmt in float utils.

This if-stmt is now invalid as inside the NGExclusionSpace there is
always at least one opportunity which has a block-end offset of
LayoutUnit::Max().

Bug: 635619
Cq-Include-Trybots: master.tryserver.chromium.linux:linux_layout_tests_layout_ng
Change-Id: I4ca866e38b4aa764b3181c59e642e2a5be422a55
Reviewed-on: https://chromium-review.googlesource.com/1028351
Reviewed-by: Aleks Totic <atotic@chromium.org>
Reviewed-by: Morten Stenshorne <mstensho@chromium.org>
Commit-Queue: Ian Kilpatrick <ikilpatrick@chromium.org>
Cr-Commit-Position: refs/heads/master@{#553780}
1 file changed