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Before this CL some os and browser routes had the same name. This was
a bit confusing. If a some c++ code called '/signout', it is not clear
if this url is a chrome or browser subpage. A distinction needed to be
made. This CL renames OS specific route SIGN_OUT, which is shared with
browser routes to a more distinguishable name OS_SIGN_OUT. Allowing this
bug(990169) to be unblocked.

Bug: 990169
Change-Id: I0733982bc48284d184a0cfdb853ef234ccc1458c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2129992
Commit-Queue: Nnamdi Theodore Johnson-kanu <tjohnsonkanu@google.com>
Reviewed-by: Xiyuan Xia <xiyuan@chromium.org>
Reviewed-by: Kyle Horimoto <khorimoto@chromium.org>
Reviewed-by: James Cook <jamescook@chromium.org>
Cr-Commit-Position: refs/heads/master@{#756575}