Convert IsSafeRedirectTarget and a couple throttles to work on UI thread

This converts a couple of the easy throttles that just needed to get
data from Profile instead of ProfileIOData, as well as converting
IsSafeRedirectTarget which now uses ExtensionRegistry instead of
extensions::InfoMap from ProfileIOData.

TBR=bsazonov@chromium.org

Bug: 824844, 976990
Change-Id: Iffb2ba970beeb4aacc0057b2f8ea6c6e0dd4b810
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1671588
Commit-Queue: Clark DuVall <cduvall@chromium.org>
Reviewed-by: Bo <boliu@chromium.org>
Reviewed-by: Kinuko Yasuda <kinuko@chromium.org>
Cr-Commit-Position: refs/heads/master@{#672239}
19 files changed