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

ui/views/test/event_generator_delegate_mac.mm

 // 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.
 
 #import <Cocoa/Cocoa.h>
 #include <stddef.h>
 
 #import "base/mac/scoped_nsobject.h"
 #import "base/mac/scoped_objc_class_swizzler.h"
 #include "base/macros.h"
@@ skipping 247 matching lines @@
   // Overridden from ui::EventHandler:
   void OnMouseEvent(ui::MouseEvent* event) override;
   void OnKeyEvent(ui::KeyEvent* event) override;
   void OnTouchEvent(ui::TouchEvent* event) override;
   void OnScrollEvent(ui::ScrollEvent* event) override;
 
   // Overridden from ui::EventSource:
   ui::EventProcessor* GetEventProcessor() override { return this; }
 
   // Overridden from ui::EventProcessor:
-  ui::EventTarget* GetRootTarget() override { return this; }
+  ui::EventTarget* GetRootForEvent(ui::Event* event) override { return this; }
+  ui::EventTargeter* GetDefaultEventTargeter() override {
+    return this->GetEventTargeter();
+  }
 
   // Overridden from ui::EventDispatcherDelegate (via ui::EventProcessor):
   bool CanDispatchToTarget(EventTarget* target) override { return true; }
 
   // Overridden from ui::EventTargeter:
   ui::EventTarget* FindTargetForEvent(ui::EventTarget* root,
                                       ui::Event* event) override {
     return root;
   }
   ui::EventTarget* FindNextBestTarget(ui::EventTarget* previous_target,
@@ skipping 337 matching lines @@
 - (NSEvent*)currentEvent {
   if (g_current_event)
     return g_current_event;
 
   // Find the original implementation and invoke it.
   IMP original = EventGeneratorDelegateMac::GetInstance()->CurrentEventMethod();
   return original(self, _cmd);
 }
 
 @end