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

ui/views/widget/desktop_aura/desktop_native_widget_aura.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 "ui/views/widget/desktop_aura/desktop_native_widget_aura.h"
 
 #include "base/bind.h"
 #include "ui/aura/client/stacking_client.h"
 #include "ui/aura/focus_manager.h"
 #include "ui/aura/root_window.h"
@@ skipping 554 matching lines @@
         ui::ER_HANDLED : ui::ER_UNHANDLED;
   } else {
     return native_widget_delegate_->OnScrollEvent(event);
   }
 }
 
 ui::EventResult DesktopNativeWidgetAura::OnTouchEvent(ui::TouchEvent* event) {
   return native_widget_delegate_->OnTouchEvent(event);
 }
 
-ui::EventResult DesktopNativeWidgetAura::OnGestureEvent(
-    ui::GestureEvent* event) {
-  return native_widget_delegate_->OnGestureEvent(event);
+void DesktopNativeWidgetAura::OnGestureEvent(ui::GestureEvent* event) {
+  native_widget_delegate_->OnGestureEvent(event);
 }
 
 ////////////////////////////////////////////////////////////////////////////////
 // DesktopNativeWidgetAura, aura::ActivationDelegate implementation:
 
 bool DesktopNativeWidgetAura::ShouldActivate() const {
   return can_activate_ && native_widget_delegate_->CanActivate();
 }
 
 void DesktopNativeWidgetAura::OnActivated() {
   if (GetWidget()->HasFocusManager())
     GetWidget()->GetFocusManager()->RestoreFocusedView();
   native_widget_delegate_->OnNativeWidgetActivationChanged(true);
   if (IsVisible() && GetWidget()->non_client_view())
     GetWidget()->non_client_view()->SchedulePaint();
 }
 
 void DesktopNativeWidgetAura::OnLostActive() {
   native_widget_delegate_->OnNativeWidgetActivationChanged(false);
   if (IsVisible() && GetWidget()->non_client_view())
     GetWidget()->non_client_view()->SchedulePaint();
 }
 
 }  // namespace views