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The Chromecast Service Name is now defined in one
file, and duplicated definitions are eliminated.

Bug: internal b/111850629.
Test: Build cast_shell.
Change-Id: I8856313bf925c4db5c444bbb7a94515c89442b28
Reviewed-on: https://chromium-review.googlesource.com/1155654Reviewed-by: Daniel Cheng <dcheng@chromium.org>
Reviewed-by: Luke Halliwell <halliwell@chromium.org>
Reviewed-by: Kenneth MacKay <kmackay@chromium.org>
Reviewed-by: Bailey Forrest <bcf@chromium.org>
Commit-Queue: Guohui Deng <guohuideng@chromium.org>
Cr-Commit-Position: refs/heads/master@{#579829}