Get rid of flat tree version of createVisibleSelection() taking two VisiblePosition

third_party/WebKit/Source/core/editing/VisibleSelection.cpp

Index: third_party/WebKit/Source/core/editing/VisibleSelection.cpp
diff --git a/third_party/WebKit/Source/core/editing/VisibleSelection.cpp b/third_party/WebKit/Source/core/editing/VisibleSelection.cpp
index 7f07e42cdd127920c4dc9336024c32ecdbb05d92..efca708b6c19212817cfe8d4e238c97a2e3e12b3 100644
--- a/third_party/WebKit/Source/core/editing/VisibleSelection.cpp
+++ b/third_party/WebKit/Source/core/editing/VisibleSelection.cpp
@@ -98,15 +98,6 @@ VisibleSelection createVisibleSelection(const Position& base,
   return createVisibleSelection(builder.build());
 }
 
-VisibleSelection createVisibleSelection(const VisiblePosition& base,
-                                        const VisiblePosition& extent,
-                                        bool isDirectional) {
-  DCHECK(base.isValid());
-  DCHECK(extent.isValid());
-  return createVisibleSelection(base.deepEquivalent(), extent.deepEquivalent(),
-                                base.affinity(), isDirectional);
-}
-
 VisibleSelectionInFlatTree createVisibleSelection(
     const SelectionInFlatTree& selection) {
   return VisibleSelectionInFlatTree::create(selection);