IndexedDB: Remove WebIDBKeyPath

Bug: 717812
Change-Id: I45942eef81822ba0de88d60bbda9297e00587d4e
Reviewed-on: https://chromium-review.googlesource.com/c/1364342
Reviewed-by: Tom Sepez <tsepez@chromium.org>
Reviewed-by: Kentaro Hara <haraken@chromium.org>
Reviewed-by: Daniel Murphy <dmurph@chromium.org>
Commit-Queue: Chase Phillips <cmp@chromium.org>
Cr-Commit-Position: refs/heads/master@{#616732}
12 files changed