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

ui/views/controls/scrollbar/native_scroll_bar.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/controls/scrollbar/native_scroll_bar.h"
 
 #include <algorithm>
 #include <string>
 
 #include "base/message_loop.h"
@@ skipping 60 matching lines @@
   return kViewClassName;
 }
 
 // Overridden from View for keyboard UI.
 bool NativeScrollBar::OnKeyPressed(const ui::KeyEvent& event) {
   if (!native_wrapper_)
     return false;
   return native_wrapper_->GetView()->OnKeyPressed(event);
 }
 
-ui::EventResult NativeScrollBar::OnGestureEvent(ui::GestureEvent* event) {
+void NativeScrollBar::OnGestureEvent(ui::GestureEvent* event) {
   if (!native_wrapper_)
-    return ui::ER_UNHANDLED;
-  return native_wrapper_->GetView()->OnGestureEvent(event);
+    return;
+  native_wrapper_->GetView()->OnGestureEvent(event);
 }
 
 bool NativeScrollBar::OnMouseWheel(const ui::MouseWheelEvent& event) {
   if (!native_wrapper_)
     return false;
   return native_wrapper_->GetView()->OnMouseWheel(event);
 }
 
 ////////////////////////////////////////////////////////////////////////////////
 // NativeScrollBar, ScrollBar overrides:
@@ skipping 13 matching lines @@
 }
 
 int NativeScrollBar::GetPosition() const {
   if (!native_wrapper_)
     return 0;
   return native_wrapper_->GetPosition();
 }
 
 }  // namespace views