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Following this CL, there will be one delegate left to add to move
download manager logic out of `HoldingSpaceKeyedService`.

Bug: 1119496
Change-Id: Ida9e3df4f45386f977ac0ce4d2a7b9f96e4cf6c2
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2383191
Commit-Queue: David Black <dmblack@google.com>
Reviewed-by: Toni Baržić <tbarzic@chromium.org>
Cr-Commit-Position: refs/heads/master@{#803010}