Volume: dismiss volume UI to avoid HUNs.

Also include headsUp in the name of the pinned callback
method.

Internal version of AOSP proposal:
  https://android-review.googlesource.com/147502

Change-Id: I8fe14bd7d65b2d3564cb1e2869d7ffbbac89e80d
diff --git a/packages/SystemUI/src/com/android/systemui/statusbar/phone/NotificationPanelView.java b/packages/SystemUI/src/com/android/systemui/statusbar/phone/NotificationPanelView.java
index 8914fb1..90e038a 100644
--- a/packages/SystemUI/src/com/android/systemui/statusbar/phone/NotificationPanelView.java
+++ b/packages/SystemUI/src/com/android/systemui/statusbar/phone/NotificationPanelView.java
@@ -2158,7 +2158,7 @@
     }
 
     @Override
-    public void onPinnedModeChanged(final boolean inPinnedMode) {
+    public void onHeadsUpPinnedModeChanged(final boolean inPinnedMode) {
         if (inPinnedMode) {
             mHeadsUpExistenceChangedRunnable.run();
             updateNotificationTranslucency();