Determine the layoutobject of middleClickAutoscroll by the scroll direction.

third_party/WebKit/Source/core/layout/LayoutBox.cpp

Index: third_party/WebKit/Source/core/layout/LayoutBox.cpp
diff --git a/third_party/WebKit/Source/core/layout/LayoutBox.cpp b/third_party/WebKit/Source/core/layout/LayoutBox.cpp
index f36b66cb19de939b00e1e070f36a93ac26ba091b..b25724f9f244fc8d2ad11d9507e016477d1926e7 100644
--- a/third_party/WebKit/Source/core/layout/LayoutBox.cpp
+++ b/third_party/WebKit/Source/core/layout/LayoutBox.cpp
@@ -1043,57 +1043,6 @@ LayoutBox* LayoutBox::findAutoscrollable(LayoutObject* layoutObject) {
                                                : nullptr;
 }
 
-static inline int adjustedScrollDelta(int beginningDelta) {
-  // This implemention matches Firefox's.
-  // http://mxr.mozilla.org/firefox/source/toolkit/content/widgets/browser.xml#856.
-  const int speedReducer = 12;
-
-  int adjustedDelta = beginningDelta / speedReducer;
-  if (adjustedDelta > 1)
-    adjustedDelta = static_cast<int>(adjustedDelta *
-                                     sqrt(static_cast<double>(adjustedDelta))) -
-                    1;
-  else if (adjustedDelta < -1)
-    adjustedDelta =
-        static_cast<int>(adjustedDelta *
-                         sqrt(static_cast<double>(-adjustedDelta))) +
-        1;
-
-  return adjustedDelta;
-}
-
-static inline IntSize adjustedScrollDelta(const IntSize& delta) {
-  return IntSize(adjustedScrollDelta(delta.width()),
-                 adjustedScrollDelta(delta.height()));
-}
-
-void LayoutBox::middleClickAutoscroll(const IntPoint& sourcePoint) {
-  LocalFrame* frame = this->frame();
-  if (!frame)
-    return;
-
-  IntPoint lastKnownMousePosition =
-      frame->eventHandler().lastKnownMousePosition();
-
-  // We need to check if the last known mouse position is out of the window.
-  // When the mouse is out of the window, the position is incoherent
-  static IntPoint previousMousePosition;
-  if (lastKnownMousePosition.x() < 0 || lastKnownMousePosition.y() < 0)
-    lastKnownMousePosition = previousMousePosition;
-  else
-    previousMousePosition = lastKnownMousePosition;
-
-  IntSize delta = lastKnownMousePosition - sourcePoint;
-
-  // at the center we let the space for the icon.
-  if (abs(delta.width()) <= AutoscrollController::noMiddleClickAutoscrollRadius)
-    delta.setWidth(0);
-  if (abs(delta.height()) <=
-      AutoscrollController::noMiddleClickAutoscrollRadius)
-    delta.setHeight(0);
-  scroll(ScrollByPixel, FloatSize(adjustedScrollDelta(delta)));
-}
-
 void LayoutBox::scrollByRecursively(const ScrollOffset& delta) {
   if (delta.isZero())
     return;