events: Change gesture-event handler in EventHandler to not return any values.

ui/aura/demo/demo_main.cc

 // Copyright (c) 2012 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.
 
 #include "base/at_exit.h"
 #include "base/command_line.h"
 #include "base/i18n/icu_util.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/message_loop.h"
 #include "third_party/skia/include/core/SkXfermode.h"
@@ skipping 55 matching lines @@
   virtual void OnDeviceScaleFactorChanged(float device_scale_factor) OVERRIDE {}
   virtual void OnWindowDestroying() OVERRIDE {}
   virtual void OnWindowDestroyed() OVERRIDE {}
   virtual void OnWindowTargetVisibilityChanged(bool visible) OVERRIDE {}
   virtual bool HasHitTestMask() const OVERRIDE { return false; }
   virtual void GetHitTestMask(gfx::Path* mask) const OVERRIDE {}
   scoped_refptr<ui::Texture> CopyTexture() {
     return scoped_refptr<ui::Texture>();
   }
 
-  // Overridden from ui::EventHandler:
-  virtual ui::EventResult OnKeyEvent(ui::KeyEvent* event) OVERRIDE {
-    return ui::ER_UNHANDLED;
-  }
-  virtual ui::EventResult OnMouseEvent(ui::MouseEvent* event) OVERRIDE {
-    return ui::ER_HANDLED;
-  }
-  virtual ui::EventResult OnTouchEvent(ui::TouchEvent* event) OVERRIDE {
-    return ui::ER_UNHANDLED;
-  }
-  virtual ui::EventResult OnGestureEvent(ui::GestureEvent* event) OVERRIDE {
-    return ui::ER_UNHANDLED;
-  }
-
  private:
   SkColor color_;
 
   DISALLOW_COPY_AND_ASSIGN(DemoWindowDelegate);
 };
 
 class DemoStackingClient : public aura::client::StackingClient {
  public:
   explicit DemoStackingClient(aura::RootWindow* root_window)
       : root_window_(root_window) {
@@ skipping 75 matching lines @@
 
   // The exit manager is in charge of calling the dtors of singleton objects.
   base::AtExitManager exit_manager;
 
   ui::RegisterPathProvider();
   icu_util::Initialize();
   ResourceBundle::InitSharedInstanceWithLocale("en-US", NULL);
 
   return DemoMain();
 }