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In order to send a URL as a param, we must be allow plain string args
which will be passed through unchanged as well as files which will be
shared and remapped.

Bug: b/168506505
Change-Id: Ica2ca4c7b79047d1811961c19e79f9db0d3cfcda
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2423744
Commit-Queue: Joel Hockey <joelhockey@chromium.org>
Reviewed-by: Jason Lin <lxj@google.com>
Cr-Commit-Position: refs/heads/master@{#809648}