[IC] Fixing crashes during metadata eviction

Metadata eviction passes base::OnceClosure() as a dummy callback. When
this is invoked, a segfault occurs. Replacing this with
base::DoNothing() is the proper way to pass a dummy callback.

Bug: 909735
Change-Id: Ib36f2ec473a7082a5b67fe184637faa7a87e0fb9
Reviewed-on: https://chromium-review.googlesource.com/c/1351534
Reviewed-by: Sky Malice <skym@chromium.org>
Reviewed-by: Filip Gorski <fgorski@chromium.org>
Commit-Queue: Brandon Wylie <wylieb@chromium.org>
Cr-Commit-Position: refs/heads/master@{#611964}
2 files changed