Revert 170406 - Align panel icons on the right / end.

ash/launcher/launcher_model.h

Index: ash/launcher/launcher_model.h
===================================================================
--- ash/launcher/launcher_model.h	(revision 170419)
+++ ash/launcher/launcher_model.h	(working copy)
@@ -47,10 +47,6 @@
   // Returns the index of the item by id.
   int ItemIndexByID(int id) const;
 
-  // Returns the index of the first panel or the index where the first panel
-  // would go if there are no panels.
-  int FirstPanelIndex() const;
-
   // Returns the id assigned to the next item added.
   LauncherID next_id() const { return next_id_; }