Revert of Preventing the default action on 'mousemove' listener shouldn't prevent selection

Source/core/page/EventHandler.cpp

Index: Source/core/page/EventHandler.cpp
diff --git a/Source/core/page/EventHandler.cpp b/Source/core/page/EventHandler.cpp
index f376e013b049d4803ab217aeca29d1c3ed974cd2..0e5258524a55d2ee8cfadc4ee43cb5c09d6bf6db 100644
--- a/Source/core/page/EventHandler.cpp
+++ b/Source/core/page/EventHandler.cpp
@@ -1499,11 +1499,10 @@
         return true;
 
     swallowEvent = !dispatchMouseEvent(EventTypeNames::mousemove, mev.innerNode(), 0, mouseEvent, true);
-
-    // http://www.w3.org/TR/DOM-Level-3-Events/#event-type-mousemove
-    // Since there is no default action for the mousemove event issue a
-    // mouse dragged event irrespective of whether the event is cancelled.
-    return handleMouseDraggedEvent(mev);
+    if (!swallowEvent)
+        swallowEvent = handleMouseDraggedEvent(mev);
+
+    return swallowEvent;
 }
 
 void EventHandler::invalidateClick()