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Bluetooth does not need the Observer part of the class as
there is no cleanup done OnContextDestroyed.

Add a Member<LocalDOMWindow> for the cases which need
ExecutionContext. This also allows removing some
To<LocalDOMWindow> casts.

Change-Id: I7fac59360b213d869e9f1e19fab116d5309dc24e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2192465Reviewed-by: Reilly Grant <reillyg@chromium.org>
Reviewed-by: Kouhei Ueno <kouhei@chromium.org>
Commit-Queue: Johann Koenig <johannkoenig@google.com>
Cr-Commit-Position: refs/heads/master@{#774858}