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This CL converts AdapterPtr, AdapterClientPtr DiscoverySessionPtr
in chrome and device to the new Mojo type, and uses
pending_remote<AdapterClient> and pending_remote<DiscoverySession>
in adapter.mojom and pending_remote<bluetooth.mojom.Adapter> in
bluetooth_internals.mojom

Bug: 955171
Change-Id: I013e11c6b5b1ce16275f22e99678f22564ebd13c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1787669
Commit-Queue: Dave Tapuska <dtapuska@chromium.org>
Reviewed-by: calamity <calamity@chromium.org>
Reviewed-by: Kinuko Yasuda <kinuko@chromium.org>
Reviewed-by: Dave Tapuska <dtapuska@chromium.org>
Reviewed-by: Reilly Grant <reillyg@chromium.org>
Cr-Commit-Position: refs/heads/master@{#694890}