DO NOT MERGE. Informs telecomm when the Phone object requests ringback

Adds support so that, if the Phone object requests that ringback be played
by the application layer on its behalf, we pass that on to Telecomm.

Bug: 15190301
Change-Id: I33b65b55dc4176250dd7ae40f27f3522c5f2e86f
diff --git a/src/com/android/phone/CallNotifier.java b/src/com/android/phone/CallNotifier.java
index 7fca845..dcb5567 100644
--- a/src/com/android/phone/CallNotifier.java
+++ b/src/com/android/phone/CallNotifier.java
@@ -345,7 +345,8 @@
                 break;
 
             case CallStateMonitor.PHONE_RINGBACK_TONE:
-                onRingbackTone((AsyncResult) msg.obj);
+                // DISABLED. The Telecomm and new ConnectionService layers are now responsible.
+                // onRingbackTone((AsyncResult) msg.obj);
                 break;
 
             case CallStateMonitor.PHONE_RESEND_MUTE: