Get Vibrator from Context instead of using private API.

Bug: 6334179

Change-Id: Ib301f850bd8ef926567f8a3093bd88d102bacd54
diff --git a/src/com/android/voicedialer/VoiceDialerActivity.java b/src/com/android/voicedialer/VoiceDialerActivity.java
index 78d9c11..47caeef 100644
--- a/src/com/android/voicedialer/VoiceDialerActivity.java
+++ b/src/com/android/voicedialer/VoiceDialerActivity.java
@@ -1090,7 +1090,7 @@
                 mAudioManager.shouldVibrate(AudioManager.VIBRATE_TYPE_RINGER)) {
             final int VIBRATOR_TIME = 150;
             final int VIBRATOR_GUARD_TIME = 150;
-            Vibrator vibrator = new Vibrator();
+            Vibrator vibrator = (Vibrator)getSystemService(VIBRATOR_SERVICE);
             vibrator.vibrate(VIBRATOR_TIME);
             msecDelay = StrictMath.max(msecDelay,
                     VIBRATOR_TIME + VIBRATOR_GUARD_TIME);