Provide access to the WindowEventDispatcher as a ui::EventProcessor.

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 5fb94e7dc04c674e3472f67d04edf3c2e8ff9f3f..b9f6e7f68ce309907e9f0571264e7fe43834817d 100644
--- a/ui/aura/test/aura_test_base.h
+++ b/ui/aura/test/aura_test_base.h
@@ -14,7 +14,6 @@
 namespace aura {
 class Window;
 class WindowDelegate;
-class WindowEventDispatcher;
 namespace test {
 
 // A base class for aura unit tests.
@@ -42,7 +41,8 @@ class AuraTestBase : public testing::Test {
   bool DispatchEventUsingWindowDispatcher(ui::Event* event);
 
   Window* root_window() { return helper_->root_window(); }
-  WindowEventDispatcher* dispatcher() { return helper_->dispatcher(); }
+  WindowTreeHost* host() { return helper_->host(); }
+  ui::EventProcessor* event_processor() { return helper_->event_processor(); }
   TestScreen* test_screen() { return helper_->test_screen(); }
 
  private: