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Profiles in bluez are not specific to a device.
When client code tries to connect to two different devices, only
one profile is created, managed by BluetoothAdapterChromeOS.

dbus messages are multiplexed based on the device desired using new
class BluetoothAdapterProfileChromeOS.

This is a resubmit with bugfixes after https://codereview.chromium.org/851123002/ was reverted by
https://codereview.chromium.org/868753006/

BUG=421207

Review URL: https://codereview.chromium.org/888913002

Cr-Commit-Position: refs/heads/master@{#314030}