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This refactor is to remove the passed URLRequestContextGetter as an
argument, preperatory to shifting cookie deletion in StoragePartitionImpl
over to Mojo interfaces.

Bug: 721395
Change-Id: I4568cb5ffd98591605a7c5d8b3850c5d8cd5d9b7
Reviewed-on: https://chromium-review.googlesource.com/754518
Commit-Queue: Randy Smith <rdsmith@chromium.org>
Reviewed-by: Devlin <rdevlin.cronin@chromium.org>
Reviewed-by: John Abd-El-Malek <jam@chromium.org>
Cr-Commit-Position: refs/heads/master@{#523520}