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This relands crrev.com/c/2590429 with the exact same changes, except
with some changes to avoid the CFI error that caused a revert
(crrev.com/c/2597715). Those differences with the original CL can be
seen by looking at the patchset 1-3 diff.

This is a reland of 4ee6e77f

Original change's description:
> Add profile DM token reading code to ConnectorsService
>
> This adds the main code to read the DM token from the profile instead of
> CBCM. The PerProfileConnectorsEnabled feature guards these changes from
> affecting working Connector policies. This change is insufficient to
> test per-profile Connectors since the authentication and reporting code
> still assume the DM token is from the browser.
>
> This adds a tweak to Connector policy test setters to ensure existing
> tests don't break and still use the browser DM token.
>
> Bug: 1148789, 1155585
> Change-Id: I64bb1714667b0b61fdfdbadffbc153328e22f741
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2590429
> Reviewed-by: Julian Pastarmov <pastarmovj@chromium.org>
> Reviewed-by: Daniel Rubery <drubery@chromium.org>
> Commit-Queue: Dominique Fauteux-Chapleau <domfc@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#838139}

Bug: 1148789
Bug: 1155585
Change-Id: Ic69ae3760171932f1f7dde8674a90b860ce22b4b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2603586Reviewed-by: Julian Pastarmov <pastarmovj@chromium.org>
Reviewed-by: Daniel Rubery <drubery@chromium.org>
Commit-Queue: Dominique Fauteux-Chapleau <domfc@chromium.org>
Cr-Commit-Position: refs/heads/master@{#840221}