Move dbus audio files to chromeos/dbus/audio

This is a purely mechanical move (plus a couple of DEPS changes):
$ ./tools/git/move_source_file.py chromeos/dbus/*audio* chromeos/dbus/audio
$ ./tools/git/move_source_file.py chromeos/dbus/volume_state* chromeos/dbus/audio

For mechanical changes:
[email protected]

Bug: 940810
Change-Id: Ie0f58e9a3082cb26ac30fdd499eb7711fd8de60a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1553390
Reviewed-by: Steven Bennetts <[email protected]>
Reviewed-by: Zentaro Kavanagh <[email protected]>
Reviewed-by: Evan Stade <[email protected]>
Commit-Queue: Steven Bennetts <[email protected]>
Cr-Commit-Position: refs/heads/master@{#648895}
diff --git a/ash/test/ash_test_helper.cc b/ash/test/ash_test_helper.cc
index fe561bc..635b3ad 100644
--- a/ash/test/ash_test_helper.cc
+++ b/ash/test/ash_test_helper.cc
@@ -31,7 +31,7 @@
 #include "base/strings/string_split.h"
 #include "base/token.h"
 #include "chromeos/audio/cras_audio_handler.h"
-#include "chromeos/dbus/cras_audio_client.h"
+#include "chromeos/dbus/audio/cras_audio_client.h"
 #include "chromeos/dbus/dbus_thread_manager.h"
 #include "chromeos/dbus/power/power_policy_controller.h"
 #include "chromeos/network/network_handler.h"