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As the comment in cache_storage.h by jkarlin@, rename DeleteCache to DoomCache.
Also rename DeleteCacheImpl to DoomCacheImpl.

BUG=
R=jkarlin@chromium.org
Signed-off-by: zhuoyu.qian <zhuoyu.qian@samsung.com>
Change-Id: I1cd75b0da724672ea0e746e749f47aa17e30e54d
Reviewed-on: https://chromium-review.googlesource.com/753204Reviewed-by: Josh Karlin <jkarlin@chromium.org>
Commit-Queue: srirama chandra sekhar <srirama.m@samsung.com>
Cr-Commit-Position: refs/heads/master@{#517386}