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Currently, CommandBufferHelper implements MemoryDumpProvider. This
interface is never used, as the relevant function is directly called
from classes which hold CommandBufferHelpers.

In fact, calling OnMemoryDump generically via the MemoryDumpProvider
interface is risky, as there are locking concerns.

Removing this interface.

Bug: 529678
Change-Id: Ic60c4afaf697d07881a8b12343ca3f2a1d9a7608
Reviewed-on: https://chromium-review.googlesource.com/c/1336512Reviewed-by: Chris Blume <cblume@chromium.org>
Commit-Queue: Eric Karl <ericrk@chromium.org>
Cr-Commit-Position: refs/heads/master@{#608645}