Remove window/host accessors from WED; IWYU for WTH

ash/sticky_keys/sticky_keys_overlay_unittest.cc

Index: ash/sticky_keys/sticky_keys_overlay_unittest.cc
diff --git a/ash/sticky_keys/sticky_keys_overlay_unittest.cc b/ash/sticky_keys/sticky_keys_overlay_unittest.cc
index 246481dcf6e07bae46569bf6134c23a7515f50ba..5a41e63e07338270e1aed2b668aa48c283d0033d 100644
--- a/ash/sticky_keys/sticky_keys_overlay_unittest.cc
+++ b/ash/sticky_keys/sticky_keys_overlay_unittest.cc
@@ -8,8 +8,9 @@
 #include "ash/sticky_keys/sticky_keys_controller.h"
 #include "ash/test/ash_test_base.h"
 #include "base/memory/scoped_ptr.h"
-#include "ui/aura/window_event_dispatcher.h"
+#include "ui/aura/window_tree_host.h"
 #include "ui/events/event.h"
+#include "ui/events/event_processor.h"
 
 namespace ash {
 
@@ -41,7 +42,7 @@ class StickyKeysOverlayTest : public test::AshTestBase {
     dispatcher.set_target(Shell::GetInstance()->GetPrimaryRootWindow());
 
     ui::EventDispatchDetails details = Shell::GetPrimaryRootWindow()->
-        GetHost()->dispatcher()->OnEventFromSource(&event);
+        GetHost()->event_processor()->OnEventFromSource(&event);
     CHECK(!details.dispatcher_destroyed);
   }