Introduce RootWindowProperty for RootWindow's properties

ash/wm/window_properties.h

Index: ash/wm/window_properties.h
diff --git a/ash/wm/window_properties.h b/ash/wm/window_properties.h
index 86ce39c9bed761cd54d3aa0548b0aee38259b56d..2fa85ed5836407e20b12c2205bbeac11d3b7b30c 100644
--- a/ash/wm/window_properties.h
+++ b/ash/wm/window_properties.h
@@ -15,9 +15,7 @@ class Rect;
 }
 
 namespace ash {
-class FramePainter;
 namespace internal {
-class RootWindowController;
 
 // Shell-specific window property keys.
 
@@ -31,9 +29,6 @@ extern const aura::WindowProperty<bool>* const kAnimateToFullscreenKey;
 // after the window is reparented to another container.
 extern const aura::WindowProperty<bool>* const kContinueDragAfterReparent;
 
-// A property key to store display_id an aura::RootWindow is mapped to.
-extern const aura::WindowProperty<int64>* const kDisplayIdKey;
-
 // A property key to indicate whether there is any chrome at all that cannot be
 // hidden when the window is fullscreen. This is unrelated to whether the full
 // chrome can be revealed by hovering the mouse at the top of the screen.
@@ -53,14 +48,6 @@ extern const aura::WindowProperty<bool>* const
 // True if this window is an attached panel.
 ASH_EXPORT extern const aura::WindowProperty<bool>* const kPanelAttachedKey;
 
-extern const aura::WindowProperty<RootWindowController*>* const
-    kRootWindowControllerKey;
-
-// RootWindow property to indicate if the window in the active workspace should
-// use the transparent "solo-window" header style.
-ASH_EXPORT extern const aura::WindowProperty<bool>* const
-    kSoloWindowHeaderKey;
-
 // If this is set to true, the window stays in the same root window
 // even if the bounds outside of its root window is set.
 // This is exported as it's used in the tests.