Move have_wheel_event_handlers to WebLayerTreeView.

third_party/WebKit/Source/core/frame/EventHandlerRegistry.cpp

 // 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.
 
 #include "core/frame/EventHandlerRegistry.h"
 
 #include "core/frame/LocalDOMWindow.h"
 #include "core/frame/LocalFrame.h"
 #include "core/html/HTMLFrameOwnerElement.h"
 #include "core/page/ChromeClient.h"
@@ skipping 185 matching lines @@
 void EventHandlerRegistry::notifyHasHandlersChanged(EventHandlerClass handlerClass, bool hasActiveHandlers)
 {
     ScrollingCoordinator* scrollingCoordinator = m_frameHost->page().scrollingCoordinator();
 
     switch (handlerClass) {
     case ScrollEvent:
         if (scrollingCoordinator)
             scrollingCoordinator->updateHaveScrollEventHandlers();
         break;
     case WheelEvent:
-        if (scrollingCoordinator)
-            scrollingCoordinator->updateHaveWheelEventHandlers();
+        m_frameHost->chromeClient().setHaveWheelEventHandlers(hasActiveHandlers);
         break;
     case TouchEvent:
         m_frameHost->chromeClient().needTouchEvents(hasActiveHandlers);
         break;
 #if ENABLE(ASSERT)
     case EventsForTesting:
         break;
 #endif
     default:
         ASSERT_NOT_REACHED();
@@ skipping 78 matching lines @@
                 ASSERT(window->frame());
                 ASSERT(window->frame()->host());
                 ASSERT(window->frame()->host() == m_frameHost);
             }
         }
     }
 #endif // ENABLE(ASSERT)
 }
 
 } // namespace blink