Commit leave behind items when tapping account switcher

There is no onclick listener for it
or onshow for the spinner popup window
this is my best guess as to how to tell when it got tapped
when the popup is shown, the dropdown views will be accessed/ built
Dismiss when cab mode is exited.

part of b/6864248 dismiss leave behind on next action taken

Change-Id: Ib706f61a47356412cef73822a4a40453214d22f2
diff --git a/src/com/android/mail/ui/AbstractActivityController.java b/src/com/android/mail/ui/AbstractActivityController.java
index 198de26..f93a550 100644
--- a/src/com/android/mail/ui/AbstractActivityController.java
+++ b/src/com/android/mail/ui/AbstractActivityController.java
@@ -1183,7 +1183,8 @@
         return mDestroyed;
     }
 
-    private void commitDestructiveActions(boolean animate) {
+    @Override
+    public void commitDestructiveActions(boolean animate) {
         ConversationListFragment fragment = getConversationListFragment();
         if (fragment != null) {
             fragment.commitDestructiveActions(animate);