Revert of Expose scroll customization for touch to JS (behind REF).

Source/core/input/EventHandler.cpp

Index: Source/core/input/EventHandler.cpp
diff --git a/Source/core/input/EventHandler.cpp b/Source/core/input/EventHandler.cpp
index 5c381756f32845f75b7aa33e1e2ec1183d90b871..12cdbb86401e965f0c1a71c5cbfca00333033208 100644
--- a/Source/core/input/EventHandler.cpp
+++ b/Source/core/input/EventHandler.cpp
@@ -188,21 +188,14 @@
     while (curBox && !curBox->isLayoutView()) {
         Node* curNode = curBox->node();
         // FIXME: this should reject more elements, as part of crbug.com/410974.
-        if (curNode && curNode->isElementNode()) {
-            Element* curElement = toElement(curNode);
-            if (curElement == frame.document()->scrollingElement())
-                break;
-            scrollChain.prepend(curElement);
-        }
+        if (curNode && curNode->isElementNode())
+            scrollChain.prepend(toElement(curNode));
         curBox = curBox->containingBlock();
     }
-    // TODO(tdresser): this should sometimes be excluded, as part of crbug.com/410974.
-    // We need to ensure that the scrollingElement is always part of
-    // the scroll chain. In quirks mode, when the scrollingElement is
-    // the body, some elements may use the documentElement as their
-    // containingBlock, so we ensure the scrollingElement is added
-    // here.
-    scrollChain.prepend(frame.document()->scrollingElement());
+
+    // FIXME: we should exclude the document in some cases, as part
+    // of crbug.com/410974.
+    scrollChain.prepend(frame.document()->documentElement());
 }
 
 EventHandler::EventHandler(LocalFrame* frame)
@@ -301,8 +294,9 @@
     m_targetForTouchID.clear();
     m_touchSequenceDocument.clear();
     m_touchSequenceUserGestureToken.clear();
-    clearGestureScrollState();
+    m_scrollGestureHandlingNode = nullptr;
     m_lastGestureScrollOverWidget = false;
+    m_previousGestureScrolledNode = nullptr;
     m_scrollbarHandlingScrollGesture = nullptr;
     m_touchPressed = false;
     m_pointerIdManager.clear();