Move ash specific cursor code to CursorManager.

ash/wm/toplevel_window_event_filter.cc

Index: ash/wm/toplevel_window_event_filter.cc
diff --git a/ash/wm/toplevel_window_event_filter.cc b/ash/wm/toplevel_window_event_filter.cc
index 5909203a118454894c38d00517709f11041579a3..335f7e22d271d353a3bea0da669f79831da4e350 100644
--- a/ash/wm/toplevel_window_event_filter.cc
+++ b/ash/wm/toplevel_window_event_filter.cc
@@ -14,6 +14,7 @@
 #include "base/message_loop.h"
 #include "base/run_loop.h"
 #include "ui/aura/client/aura_constants.h"
+#include "ui/aura/client/cursor_client.h"
 #include "ui/aura/env.h"
 #include "ui/aura/root_window.h"
 #include "ui/aura/window.h"
@@ -267,7 +268,10 @@ void ToplevelWindowEventFilter::RunMoveLoop(aura::Window* source,
         root_window, source->parent(), &drag_location);
   }
   CreateScopedWindowResizer(source, drag_location, HTCAPTION);
-  source->GetRootWindow()->SetCursor(ui::kCursorPointer);
+  aura::client::CursorClient* cursor_client =
+      aura::client::GetCursorClient(root_window);
+  if (cursor_client)
+    cursor_client->SetCursor(ui::kCursorPointer);
 #if !defined(OS_MACOSX)
   MessageLoopForUI* loop = MessageLoopForUI::current();
   MessageLoop::ScopedNestableTaskAllower allow_nested(loop);