aura: Remove event-dispatch methods from WindowTreeHostDelegate interface.

ui/aura/test/aura_test_base.h

Index: ui/aura/test/aura_test_base.h
diff --git a/ui/aura/test/aura_test_base.h b/ui/aura/test/aura_test_base.h
index 971fdba223d13e89be695c494b8f9f7e695527d3..5b07bf719e7fadc656f03261493253fe081e3928 100644
--- a/ui/aura/test/aura_test_base.h
+++ b/ui/aura/test/aura_test_base.h
@@ -37,6 +37,10 @@ class AuraTestBase : public testing::Test {
 
   void ParentWindow(Window* window);
 
+  // A convenience function for dispatching an event to |dispatcher()|.
+  // Returns whether |event| was handled.
+  bool DispatchEventUsingWindowDispatcher(ui::Event* event);
+
   Window* root_window() { return helper_->root_window(); }
   RootWindow* dispatcher() { return helper_->dispatcher(); }
   TestScreen* test_screen() { return helper_->test_screen(); }