API Cleanup: Remove VideoState class.

- Remove VideoState class.
- Replace references to VideoState constants with VideoProfile equivalent.
- Push VideoState static methods into VideoProfile.

Bug: 21573551
Change-Id: I1bca02772b5b7d86643f612824b07faef7618725

telecomm/java/android/telecom/Connection.java

@@ -1608,7 +1608,7 @@ public abstract class Connection extends Conferenceable {
      * a request to accept.
      */
     public void onAnswer() {
-        onAnswer(VideoProfile.VideoState.AUDIO_ONLY);
+        onAnswer(VideoProfile.STATE_AUDIO_ONLY);
     }
 
     /**