Clear descendant floats when moving children of a multicol container to a flowthread

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

Index: third_party/WebKit/Source/core/layout/LayoutMultiColumnFlowThread.cpp
diff --git a/third_party/WebKit/Source/core/layout/LayoutMultiColumnFlowThread.cpp b/third_party/WebKit/Source/core/layout/LayoutMultiColumnFlowThread.cpp
index 4003121b79100428644913e4a3d0fb281ff6bf17..6abc3f1acda2db7fc7e935a53b9bcb890eebbf48 100644
--- a/third_party/WebKit/Source/core/layout/LayoutMultiColumnFlowThread.cpp
+++ b/third_party/WebKit/Source/core/layout/LayoutMultiColumnFlowThread.cpp
@@ -245,6 +245,7 @@ void LayoutMultiColumnFlowThread::populate()
     // Reparent children preceding the flow thread into the flow thread. It's multicol content
     // now. At this point there's obviously nothing after the flow thread, but layoutObjects (column
     // sets and spanners) will be inserted there as we insert elements into the flow thread.
+    multicolContainer->removeFloatingObjectsFromDescendants();
     multicolContainer->moveChildrenTo(this, multicolContainer->firstChild(), this, true);
 }