indexeddb: remove unneeded content includes

This will help move indexeddb to components/services/storage.

Bug: 1015214
Change-Id: Id391961bcb8c3b19e44b650dc33c8e729b845183
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2068872
Auto-Submit: enne <enne@chromium.org>
Commit-Queue: Daniel Murphy <dmurph@chromium.org>
Reviewed-by: Daniel Murphy <dmurph@chromium.org>
Cr-Commit-Position: refs/heads/master@{#744094}
6 files changed