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

ui/aura/demo/demo_main.cc

Index: ui/aura/demo/demo_main.cc
diff --git a/ui/aura/demo/demo_main.cc b/ui/aura/demo/demo_main.cc
index b1ab577f7de88b09cc5911de4d1da36350fddd25..64614b90e099f2b9e9ba019a74a85ddc7ad2b132 100644
--- a/ui/aura/demo/demo_main.cc
+++ b/ui/aura/demo/demo_main.cc
@@ -73,20 +73,6 @@ class DemoWindowDelegate : public aura::WindowDelegate {
     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_;