Revert 149869 because it broke ash_unittests on win_aura and linux_chromeos.

ash/shell_window_ids.h

Index: ash/shell_window_ids.h
===================================================================
--- ash/shell_window_ids.h	(revision 149877)
+++ ash/shell_window_ids.h	(working copy)
@@ -57,31 +57,28 @@
 // the AppList and SystemModal dialogs.
 const int kShellWindowId_InputMethodContainer = 11;
 
-// The container for the lock screen background.
-const int kShellWindowId_LockScreenBackgroundContainer = 12;
-
 // The container for the lock screen.
-const int kShellWindowId_LockScreenContainer = 13;
+const int kShellWindowId_LockScreenContainer = 12;
 
 // The container for the lock screen modal windows.
-const int kShellWindowId_LockSystemModalContainer = 14;
+const int kShellWindowId_LockSystemModalContainer = 13;
 
 // The container for the status area.
-const int kShellWindowId_StatusContainer = 15;
+const int kShellWindowId_StatusContainer = 14;
 
 // The container for menus.
-const int kShellWindowId_MenuContainer = 16;
+const int kShellWindowId_MenuContainer = 15;
 
 // The container for drag/drop images and tooltips.
-const int kShellWindowId_DragImageAndTooltipContainer = 17;
+const int kShellWindowId_DragImageAndTooltipContainer = 16;
 
 // The container for bubbles briefly overlaid onscreen to show settings changes
 // (volume, brightness, etc.).
-const int kShellWindowId_SettingBubbleContainer = 18;
+const int kShellWindowId_SettingBubbleContainer = 17;
 
 // The container for special components overlaid onscreen, such as the
 // region selector for partial screenshots.
-const int kShellWindowId_OverlayContainer = 19;
+const int kShellWindowId_OverlayContainer = 18;
 
 }  // namespace internal