Clean up WindowEventDispatcher some more.

ash/sticky_keys/sticky_keys_overlay_unittest.cc

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "ash/sticky_keys/sticky_keys_overlay.h"
 
 #include "ash/shell.h"
 #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_delegate.h"
 #include "ui/events/event.h"
 
 namespace ash {
 
 class StickyKeysOverlayTest : public test::AshTestBase {
  public:
   StickyKeysOverlayTest() :
       controller_(NULL),
       overlay_(NULL) {}
 
@@ skipping 174 matching lines @@
   EXPECT_FALSE(overlay_->is_visible());
   EXPECT_EQ(STICKY_KEY_STATE_DISABLED,
             overlay_->GetModifierKeyState(ui::EF_CONTROL_DOWN));
   EXPECT_EQ(STICKY_KEY_STATE_DISABLED,
             overlay_->GetModifierKeyState(ui::EF_SHIFT_DOWN));
   EXPECT_EQ(STICKY_KEY_STATE_DISABLED,
             overlay_->GetModifierKeyState(ui::EF_ALT_DOWN));
 }
 
 }  // namespace ash