Move scroll event handlers from layer to layer tree view.

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

Index: third_party/WebKit/Source/core/frame/EventHandlerRegistry.cpp
diff --git a/third_party/WebKit/Source/core/frame/EventHandlerRegistry.cpp b/third_party/WebKit/Source/core/frame/EventHandlerRegistry.cpp
index 2ce0f9e62096f4626b0e6e3aad70a93cbb05a348..1a8c32ca33cbb0f9825f24aa48f71c1b88e8461e 100644
--- a/third_party/WebKit/Source/core/frame/EventHandlerRegistry.cpp
+++ b/third_party/WebKit/Source/core/frame/EventHandlerRegistry.cpp
@@ -195,12 +195,9 @@ void EventHandlerRegistry::didRemoveAllEventHandlers(EventTarget& target)
 
 void EventHandlerRegistry::notifyHasHandlersChanged(EventHandlerClass handlerClass, bool hasActiveHandlers)
 {
-    ScrollingCoordinator* scrollingCoordinator = m_frameHost->page().scrollingCoordinator();
-
     switch (handlerClass) {
     case ScrollEvent:
-        if (scrollingCoordinator)
-            scrollingCoordinator->updateHaveScrollEventHandlers();
+        m_frameHost->chromeClient().setHaveScrollEventHandlers(hasActiveHandlers);
         break;
     case WheelEvent:
         m_frameHost->chromeClient().setHaveWheelEventHandlers(hasActiveHandlers);