Revert of Cleaning up MruWindowTracker::BuildWindowList()

ash/wm/mru_window_tracker.h

Index: ash/wm/mru_window_tracker.h
diff --git a/ash/wm/mru_window_tracker.h b/ash/wm/mru_window_tracker.h
index 4ed06a3dadc4f6bc9e045072ee0a79594be44ee8..6f6dd5f0b338b0b06538c485300a967fde0f4643 100644
--- a/ash/wm/mru_window_tracker.h
+++ b/ash/wm/mru_window_tracker.h
@@ -40,9 +40,10 @@
   // the vector based on the current set of windows across all valid root
   // windows. As a result it is not necessarily the same as the set of
   // windows being iterated over.
-  // The returned window list will be in descending (top most window first)
-  // order.
-  static WindowList BuildWindowList();
+  // If |top_most_at_end| the window list will return in ascending (lowest
+  // window in stacking order first) order instead of the default descending
+  // (top most window first) order.
+  static WindowList BuildWindowList(bool top_most_at_end);
 
   // Returns the set of windows which can be cycled through using the tracked
   // list of most recently used windows.