GitLab

Refactor FileManager to accept a DirectoryKey rather than a GURL. This
makes it more ammenable to possibly supporting other keys for creating
directories such as tab id, UnguessableTokens, etc.

Bug: 1055505
Change-Id: Id93cc1bcbfdfdd69baf0f57764636dcbcd62c3f3
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2070737Reviewed-by: Michael Thiessen <mthiesse@chromium.org>
Reviewed-by: Mehran Mahmoudi <mahmoudi@chromium.org>
Commit-Queue: Calder Kitagawa <ckitagawa@chromium.org>
Cr-Commit-Position: refs/heads/master@{#745050}