Fix dragging text inside a input element nested in a draggable element.

Source/core/page/DragActions.h

Index: Source/core/page/DragActions.h
diff --git a/Source/core/page/DragActions.h b/Source/core/page/DragActions.h
index d98c9c40e2ae737393a3ae792f4830925120f043..ce42ab777d91e6a04b50b49659fc9f7797b697d1 100644
--- a/Source/core/page/DragActions.h
+++ b/Source/core/page/DragActions.h
@@ -39,13 +39,12 @@ namespace WebCore {
         DragDestinationActionAny     = UINT_MAX
     } DragDestinationAction;
 
-    // WebCoreDragSourceAction should be kept in sync with WebDragSourceAction
     typedef enum {
-        DragSourceActionNone         = 0,
-        DragSourceActionDHTML        = 1,
-        DragSourceActionImage        = 2,
-        DragSourceActionLink         = 4,
-        DragSourceActionSelection    = 8,
+        DragSourceActionNone,
+        DragSourceActionDHTML,
+        DragSourceActionImage,
+        DragSourceActionLink,
+        DragSourceActionSelection,
     } DragSourceAction;
 
     //matches NSDragOperation