Move GetRootWindowController() to root_window_controller.h

ash/extended_desktop_unittest.cc

Index: ash/extended_desktop_unittest.cc
diff --git a/ash/extended_desktop_unittest.cc b/ash/extended_desktop_unittest.cc
index d36e824089330a0530ca65ae5d8ea068da62ad31..31dbd15ec7a6a5f555035d8b4c5e22709661f181 100644
--- a/ash/extended_desktop_unittest.cc
+++ b/ash/extended_desktop_unittest.cc
@@ -11,7 +11,6 @@
 #include "ash/system/tray/system_tray.h"
 #include "ash/test/ash_test_base.h"
 #include "ash/wm/coordinate_conversion.h"
-#include "ash/wm/property_util.h"
 #include "ash/wm/window_cycle_controller.h"
 #include "ash/wm/window_properties.h"
 #include "ash/wm/window_util.h"
@@ -168,7 +167,7 @@ TEST_F(ExtendedDesktopTest, Basic) {
   ASSERT_EQ(2U, root_windows.size());
   for (Shell::RootWindowList::const_iterator iter = root_windows.begin();
        iter != root_windows.end(); ++iter) {
-    EXPECT_TRUE(GetRootWindowController(*iter) != NULL);
+    EXPECT_TRUE(internal::GetRootWindowController(*iter) != NULL);
   }
   // Make sure root windows share the same controllers.
   EXPECT_EQ(aura::client::GetFocusClient(root_windows[0]),