Fix bug 3146938 - Menus spawned by ActionBar should hide when action

bar is hidden

Any popup spawned by the private class MenuPopupHelper will be hidden
if its anchor becomes hidden. ("hidden" == !View#isShown())

Fix a bug where ActionBar subtitle views were not going away when
subtitle text was set to null.

Fix a bug when switching out of ActionBar tabbed nav mode with no
active tabs.

Change-Id: I1f30c067156221f96905ac69ab876418ad2e94f8