Fixes bugs in cursor handling

services/ui/ws/window_server.h

Index: services/ui/ws/window_server.h
diff --git a/services/ui/ws/window_server.h b/services/ui/ws/window_server.h
index 709cf9e0540302f42b8a617309c9b057e8257db7..a71ebdf380d8c2bf9713953f4739a9cd64281c3d 100644
--- a/services/ui/ws/window_server.h
+++ b/services/ui/ws/window_server.h
@@ -123,7 +123,7 @@ class WindowServer : public ServerWindowDelegate,
   // Returns true if OnTreeMessagedClient() was invoked for id.
   bool DidTreeMessageClient(ClientSpecificId id) const;
 
-  // Returns the WindowTree that has |id| as a root.
+  // Returns the WindowTree that has |window| as a root.
   WindowTree* GetTreeWithRoot(const ServerWindow* window) {
     return const_cast<WindowTree*>(
         const_cast<const WindowServer*>(this)->GetTreeWithRoot(window));