Change whitespace.txt

Will use this change to test reverting in the Gerrit UI.
Using TBR= so as to not spam anyone else.

TBR=

Change-Id: If95898b00d6468512157d120e24c8246c1655f8f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/tools/depot_tools/+/2645231
Commit-Queue: Edward Lesmes <ehmaldonado@chromium.org>
Reviewed-by: Edward Lesmes <ehmaldonado@chromium.org>

whitespace.txt

+Hello world!
\ No newline at end of file