Avoid two targeting phases in aura client-lib and EventProcessor.

ash/wm/immersive_fullscreen_controller_unittest.cc

Index: ash/wm/immersive_fullscreen_controller_unittest.cc
diff --git a/ash/wm/immersive_fullscreen_controller_unittest.cc b/ash/wm/immersive_fullscreen_controller_unittest.cc
index a9665e5fddb555b4d133635f86933275d85bf773..fc97085d6ba1807a6c707aada0b576f658dbc845 100644
--- a/ash/wm/immersive_fullscreen_controller_unittest.cc
+++ b/ash/wm/immersive_fullscreen_controller_unittest.cc
@@ -736,8 +736,9 @@ TEST_F(ImmersiveFullscreenControllerTest, EventsDoNotLeakToWindowUnderneath) {
 
   ui::TouchEvent touch(ui::ET_TOUCH_MOVED, gfx::Point(10, top), 0,
                        ui::EventTimeForNow());
-  ui::EventTarget* root = window()->GetRootWindow();
-  ui::EventTargeter* targeter = root->GetEventTargeter();
+  aura::Window* root = window()->GetRootWindow();
+  ui::EventTargeter* targeter =
+      root->GetHost()->dispatcher()->GetDefaultEventTargeter();
   EXPECT_EQ(window(), targeter->FindTargetForEvent(root, &touch));
 
   SetEnabled(true);