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If a launch or stop session request is made for a channel ID when
there still is an outstanding request for the same ID, then the
subsequent requests had their callbacks dropped, which was problematic
especially if the callbacks were Mojo callbacks. This change ensures
that we call them.

Bug: 1148083, b/173533007
Change-Id: Ie99b76ea0716913f91faac97bccff41418e4b25b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2545263Reviewed-by: John Williams <jrw@chromium.org>
Reviewed-by: mark a. foltz <mfoltz@chromium.org>
Commit-Queue: Takumi Fujimoto <takumif@chromium.org>
Cr-Commit-Position: refs/heads/master@{#828497}