Move root_window.* to window_event_dispatcher.*

http://crbug.com/308843
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Review URL: https://codereview.chromium.org/174803002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@252651 0039d316-1c4b-4281-b951-d872f2087c98
diff --git a/ui/snapshot/snapshot_aura_unittest.cc b/ui/snapshot/snapshot_aura_unittest.cc
index 00b50297..257f854 100644
--- a/ui/snapshot/snapshot_aura_unittest.cc
+++ b/ui/snapshot/snapshot_aura_unittest.cc
@@ -7,12 +7,12 @@
 #include "base/bind.h"
 #include "base/test/test_simple_task_runner.h"
 #include "testing/gtest/include/gtest/gtest.h"
-#include "ui/aura/root_window.h"
 #include "ui/aura/test/aura_test_helper.h"
 #include "ui/aura/test/test_screen.h"
 #include "ui/aura/test/test_window_delegate.h"
 #include "ui/aura/test/test_windows.h"
 #include "ui/aura/window.h"
+#include "ui/aura/window_event_dispatcher.h"
 #include "ui/compositor/layer.h"
 #include "ui/compositor/test/context_factories_for_test.h"
 #include "ui/compositor/test/draw_waiter_for_test.h"