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These constants used to be defined in the factory and passed into the
service. However, they're always the same, so might just as well be
defined directly in the service. This avoids having to duplicate them
in other factories (for iOS).

Bug: 1102314
Change-Id: I518dcd04524f5a7e7e9399d66a4adc775df2aaf3
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2400419
Commit-Queue: Marc Treib <treib@chromium.org>
Reviewed-by: Mikel Astiz <mastiz@chromium.org>
Cr-Commit-Position: refs/heads/master@{#805288}