Clear out any existing buttons before adding the set of requested actions.

Bug: 6459557
Change-Id: Id19050e7280208d4f98c1aabe8087c6fe6c8d72a

Author: cwren

core/java/android/app/Notification.java

@@ -1432,6 +1432,7 @@ private RemoteViews applyStandardTemplateWithActions(int layoutId) {
                 // Log.d("Notification", "has actions: " + mContentText);
                 big.setViewVisibility(R.id.actions, View.VISIBLE);
                 if (N>3) N=3;
+                big.removeAllViews(R.id.actions);
                 for (int i=0; i<N; i++) {
                     final RemoteViews button = generateActionButton(mActions.get(i));
                     //Log.d("Notification", "adding action " + i + ": " + mActions.get(i).title);