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Previously, the ClientSideDetectionService was running two ModelLoaders,
one for the regular model, and one for the SBER model. This CL makes the
ClientSideDetectionService track the SB prefs, so it can only load the
model needed for that profile.

Bug: 1068623
Change-Id: I544c059caa3a2545dc41771fc0bee04a808b5992
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2249162Reviewed-by: Bettina Dea <bdea@chromium.org>
Commit-Queue: Daniel Rubery <drubery@chromium.org>
Cr-Commit-Position: refs/heads/master@{#780046}