Clip abspos descendants correctly in all columns (not just the first).

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 04df0409cb18e2abbfa6fd7ce834aec01114fa0f..f18a5344aa3074c7797d855b9e7077ba89012fa8 100644
--- a/third_party/WebKit/Source/core/layout/LayoutBox.cpp
+++ b/third_party/WebKit/Source/core/layout/LayoutBox.cpp
@@ -1691,18 +1691,8 @@ LayoutSize LayoutBox::offsetFromContainer(const LayoutObject* o, const LayoutPoi
     if (isInFlowPositioned())
         offset += offsetForInFlowPosition();
 
-    if (!isInline() || isReplaced()) {
+    if (!isInline() || isReplaced())
         offset += topLeftLocationOffset();
-        if (o->isLayoutFlowThread()) {
-            // So far the point has been in flow thread coordinates (i.e. as if everything in
-            // the fragmentation context lived in one tall single column). Convert it to a
-            // visual point now.
-            LayoutPoint pointInContainer = point + offset;
-            offset += o->columnOffset(pointInContainer);
-            if (offsetDependsOnPoint)
-                *offsetDependsOnPoint = true;
-        }
-    }
 
     if (o->hasOverflowClip())
         offset -= toLayoutBox(o)->scrolledContentOffset();