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The ShaderClearHelper never runs the callback if there is no cache to clear.
Clearing shader cache is part of the BrowsingDataRemover's procedure when
DATA_TYPE_CACHE flag is set. So this results in BrowsingDataRemover never
reporting completion to its observers.

Bug: 1020168
Change-Id: I23ba6ed2a99b6c44acf0b349dd398f26133369a9
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1890310Reviewed-by: Kenneth Russell <kbr@chromium.org>
Reviewed-by: Bo <boliu@chromium.org>
Commit-Queue: Pavel Shmakov <pshmakov@chromium.org>
Cr-Commit-Position: refs/heads/master@{#711359}