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This CL introduces functions to get the ID name of the following
special devices in AudioManager.
- Default audio input device
- Communications audio input device
- Communications audio output device

There was already a similar function for the default audio output device.

In enumeration results, the label of special device entries now have
appended the label of the corresponding real device.

This CL also adds implementation of the new functionality for Mac,
and reverts the effects of http://crrev.com/520087, which implemented
similar but more limited functionality.

Bug: 780492
Cq-Include-Trybots: master.tryserver.chromium.android:android_optional_gpu_tests_rel;master.tryserver.chromium.linux:linux_optional_gpu_tests_rel;master.tryserver.chromium.mac:mac_optional_gpu_tests_rel;master.tryserver.chromium.win:win_optional_gpu_tests_rel
Change-Id: Iee5afc2fc231913baddaf6ef3fedd4535b3d9841
Reviewed-on: https://chromium-review.googlesource.com/803814Reviewed-by: Olga Sharonova <olka@chromium.org>
Commit-Queue: Guido Urdaneta <guidou@chromium.org>
Cr-Commit-Position: refs/heads/master@{#521682}