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The sw600dp layout location_bar_icon differed from the unqualified
variant only with the value of end padding until they diverged in
http://crrev.com/c/1653842

Now the alternative layout is merged back into the default variant.
All overrides are now in values-sw600dp/dimens.xml

Values location_bar_icon_* and location_bar_start_icon_* were
identical, so now the latter values are removed.

Bug: 1130414
Change-Id: I087861fbab00768009ed881bc3753a83a8458f0f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2427211Reviewed-by: Ted Choc <tedchoc@chromium.org>
Reviewed-by: Brandon Wylie <wylieb@chromium.org>
Commit-Queue: Ted Choc <tedchoc@chromium.org>
Auto-Submit: who/bttk <bttk@chromium.org>
Cr-Commit-Position: refs/heads/master@{#812137}