Remove deprecated telecom APIs. Mark others final.

Bug:
Change-Id: I8a04903052a964f3997b5bb36730b8b200c8e472
diff --git a/telecomm/java/android/telecom/InCallService.java b/telecomm/java/android/telecom/InCallService.java
index c0c59fa..1f7547d 100644
--- a/telecomm/java/android/telecom/InCallService.java
+++ b/telecomm/java/android/telecom/InCallService.java
@@ -177,7 +177,7 @@
      *         if the {@code InCallService} is not in a state where it has an associated
      *         {@code Phone}.
      */
-    public Phone getPhone() {
+    public final Phone getPhone() {
         return mPhone;
     }