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This CL fixes media_unittests in a component build.
The issue was a duplicate global feature object since media_switches.cc
is inside a source set.

Bug: 1123898
Change-Id: I97f18f166af4da4924ec191de6c183426e942aec
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2387578Reviewed-by: Dale Curtis <dalecurtis@chromium.org>
Commit-Queue: Sergey Abbakumov <sabbakumov@yandex-team.ru>
Cr-Commit-Position: refs/heads/master@{#804143}