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The file preview icon on the discovery page and confirmation page needs
to be grey whenever those pages are in an error state. This CL adds a
|disabled| property to nearby-preview that when true applies a css
class that makes the icon grey.

Bug: b/163036847
Change-Id: I4a0f24a1ed9f013d499eb2dff9bf24064f0898e9
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2554901Reviewed-by: James Vecore <vecore@google.com>
Reviewed-by: Kyle Horimoto <khorimoto@chromium.org>
Commit-Queue: Curt Clemens <cclem@google.com>
Cr-Commit-Position: refs/heads/master@{#830550}