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This allows WebBT to work if we were connected before or after the WebBT
application starts.

Remove BluetoothAdapterCast::OnServicesUpdated because Connect now
implies services are discovered. Dynamic service updating is also
deprecated:
https://cs.chromium.org/chromium/src/device/bluetooth/bluetooth_adapter.h?rcl=21e8d8c8dc11cd4b8f77c47b7f37098ebde13d3a&l=142

BUG=internal b/79542125
TEST=device_unittests. Manual

Change-Id: I99ed5dc61942cb310ed76581648fdab6c31316a1
Reviewed-on: https://chromium-review.googlesource.com/1058605
Commit-Queue: Bailey Forrest <bcf@chromium.org>
Reviewed-by: Stephen Lanham <slan@chromium.org>
Reviewed-by: Reilly Grant <reillyg@chromium.org>
Cr-Commit-Position: refs/heads/master@{#558898}