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This is a mostly mechanical change to move the nearby-device-icon
Polymer component from being chrome://nearby (Poylmer3) only to being
shared with chrome://os-settings (Polymer2/3). This necessary for Nearby
Share's launch despite Polymer2 being phased out (the conversion won't
be complete in time for M-89 launch).

A Few other small changes were necessary:
- Fixed a copy/paste issue with resource_path_rewrites
- Make the nearby_share/shared folder CrOS only. There was still a
lingering referenced to the closure compiler targets that were not CrOS
only.
- Refactored browser test to not use the mojo interfaces from a const
expression (necessary for Polymer2).
- Copied icons from icons to the existing shared icon set (old icons
will be cleaned up in a follow up CL.

Bug: 1156035

Change-Id: Ic913ca66e814097524ebf29fd7eb0c89aad82d68
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2571804
Commit-Queue: James Vecore <vecore@google.com>
Reviewed-by: Kyle Horimoto <khorimoto@chromium.org>
Cr-Commit-Position: refs/heads/master@{#834609}