This reverts a well-intentioned bugfix that made ActionBarOverlayLayout focusable in touch mode and caused issues with some activity layouts. Removes the associated key handling code for the Back key in ActionBarOverlayLayout and handles it at a higher level in Activity instead. (This same code path was already in use by ToolbarActionBar.) Bug 17105724 Change-Id: I57e4cace44a6d11f25a2549644b565446d616a52