Move GetRootWindowController() to root_window_controller.h

ash/system/tray/tray_event_filter.cc

Index: ash/system/tray/tray_event_filter.cc
diff --git a/ash/system/tray/tray_event_filter.cc b/ash/system/tray/tray_event_filter.cc
index 949b2f93a175838bb671b90add115a0b97b4b842..a5ea3a24d37ca78473d754ff043963cbcfc37f98 100644
--- a/ash/system/tray/tray_event_filter.cc
+++ b/ash/system/tray/tray_event_filter.cc
@@ -12,7 +12,6 @@
 #include "ash/system/tray/tray_bubble_wrapper.h"
 #include "ash/system/tray/tray_constants.h"
 #include "ash/system/tray/tray_event_filter.h"
-#include "ash/wm/property_util.h"
 #include "ui/aura/client/screen_position_client.h"
 #include "ui/aura/root_window.h"
 #include "ui/aura/window.h"
@@ -57,10 +56,10 @@ bool TrayEventFilter::ProcessLocatedEvent(ui::LocatedEvent* event) {
   if (event->target()) {
     aura::Window* target = static_cast<aura::Window*>(event->target());
     // Don't process events that occurred inside an embedded menu.
-    ash::internal::RootWindowController* root_controller =
-        ash::GetRootWindowController(target->GetRootWindow());
+    internal::RootWindowController* root_controller =
+        internal::GetRootWindowController(target->GetRootWindow());
     if (root_controller && root_controller->GetContainer(
-            ash::internal::kShellWindowId_MenuContainer)->Contains(target)) {
+            internal::kShellWindowId_MenuContainer)->Contains(target)) {
       return false;
     }
   }