Separated alt-tab window cycle from overview mode

ash/wm/overview/window_overview.h

Index: ash/wm/overview/window_overview.h
diff --git a/ash/wm/overview/window_overview.h b/ash/wm/overview/window_overview.h
index 502e3d921e886dbc3e453750ac7948f3a5966cac..f914ec147ed72b0c2282a0680d2c31ad273afcf3 100644
--- a/ash/wm/overview/window_overview.h
+++ b/ash/wm/overview/window_overview.h
@@ -47,8 +47,7 @@ class WindowOverview : public ui::EventHandler,
   // If |single_root_window| is not NULL, all windows will be positioned on the
   // given root window.
   WindowOverview(WindowSelector* window_selector,
-                 WindowSelectorItemList* windows,
-                 aura::Window* single_root_window);
+                 WindowSelectorItemList* windows);
   virtual ~WindowOverview();
 
   // Sets the selected window to be the window in position |index|.
@@ -57,9 +56,6 @@ class WindowOverview : public ui::EventHandler,
   // Dispatched when the list of windows has changed.
   void OnWindowsChanged();
 
-  // Moves the overview to only |root_window|.
-  void MoveToSingleRootWindow(aura::Window* root_window);
-
   // ui::EventHandler:
   virtual void OnKeyEvent(ui::KeyEvent* event) OVERRIDE;
   virtual void OnMouseEvent(ui::MouseEvent* event) OVERRIDE;