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Apparently back in 2011, undoing a cut in TextfieldModel would restore the cut
text with incorrectly reversed selection direction. This was evident when then
modifying the selection (e.g. shift + arrows/home/end).

This was worked around by reversing the selection an additional time. However,
the original reversal no longer occurs, so the workaround is now causing the bug
it was meant to fix.

This CL removes the workaround selection-reversal.

Bug: 1017179
Change-Id: If230de84455b5be5feedc12ba6636668642e68dd
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1875474
Commit-Queue: manuk hovanesian <manukh@chromium.org>
Reviewed-by: Peter Boström <pbos@chromium.org>
Cr-Commit-Position: refs/heads/master@{#709049}