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This patch continues to move methods from IndexedDBContext to the mojo
interface IndexedDBControl. In particular, this is moving the method
DeleteForOrigin.

This patch also removes the now unnecessary leveldb workaround for empty
directories.

See tracking doc here:
https://docs.google.com/document/d/18suNOOzuEJbqgRJF0MB2VqdTyYqS4cvI2PGaCpyPXSw/edit?ts=5e138c46#heading=h.23paiqht163

Bug: 1015214
Change-Id: I36bccba416c7a5b182f1f85e01a02cc3e1e40623
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1988811Reviewed-by: enne <enne@chromium.org>
Reviewed-by: John Abd-El-Malek <jam@chromium.org>
Reviewed-by: Ken Rockot <rockot@google.com>
Reviewed-by: Emily Stark <estark@chromium.org>
Reviewed-by: Joshua Bell <jsbell@chromium.org>
Commit-Queue: Daniel Murphy <dmurph@chromium.org>
Cr-Commit-Position: refs/heads/master@{#730034}