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It's not used. Moving these files and deps to the
enable_extensions branch of the build target matches
what's done in //chrome/browser/media/router/BUILD.gn

Bug: 1057100
Change-Id: I5c3cb21071776a3a22bedbef00ebe998e43e4253
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2364557Reviewed-by: mark a. foltz <mfoltz@chromium.org>
Commit-Queue: Evan Stade <estade@chromium.org>
Cr-Commit-Position: refs/heads/master@{#800275}