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As decided in https://goo.gl/g5Srzn, we're no longer doing BattOr power
measurement on the waterfall and consequently can't justify maintaining
the significant C++ code required to do interactive BattOr tracing.

This is the first Chrome-side CL to delete that code.

(For additional context, see https://goo.gl/P9AR84 (google internal)
or ping me to chat.)

TBR=avi for BUILD.gn

Bug: 859514
Change-Id: I4b6c0c6ac40abe9c593ce24e1bb0d68a4eeacd42
Reviewed-on: https://chromium-review.googlesource.com/1122489
Commit-Queue: Charlie Andrews <charliea@chromium.org>
Reviewed-by: Avi Drissman <avi@chromium.org>
Reviewed-by: oysteine <oysteine@chromium.org>
Cr-Commit-Position: refs/heads/master@{#579055}