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Since 'volume' has been removed from the standard specification[1], this
CL removes support for the 'volume' from the output of
MediaStreamTrack.getSettings(). Further, this CL removes the related
existing tests.

Intent to deprecate and remove:
https://groups.google.com/a/chromium.org/forum/#!topic/blink-dev/8-Qn7pu41Kk

[1] https://github.com/w3c/mediacapture-main/issues/585

BUG=942016

Change-Id: I8cfcd5d119f79d4da73ee5aa94770f2cd2b7f881
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1630156Reviewed-by: Guido Urdaneta <guidou@chromium.org>
Reviewed-by: Kent Tamura <tkent@chromium.org>
Commit-Queue: Armando Miraglia <armax@chromium.org>
Cr-Commit-Position: refs/heads/master@{#664126}