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

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 acc3e6ab9ddc781a624adc7a1523d647a044ab4e..ed0896a02cd6952e2489d7e194a921f18686f5ee 100644
--- a/third_party/WebKit/Source/core/editing/VisibleSelection.cpp
+++ b/third_party/WebKit/Source/core/editing/VisibleSelection.cpp
@@ -159,18 +159,6 @@ VisibleSelectionInFlatTree createVisibleSelection(
 }
 
 VisibleSelectionInFlatTree createVisibleSelection(
-    const VisiblePositionInFlatTree& base,
-    const VisiblePositionInFlatTree& extent,
-    bool isDirectional) {
-  DCHECK(base.isValid());
-  DCHECK(extent.isValid());
-  // TODO(xiaochengh): We should check |base.isNotNull() || extent.isNull()|
-  // after all call sites have ensured that.
-  return createVisibleSelection(base.deepEquivalent(), extent.deepEquivalent(),
-                                base.affinity(), isDirectional);
-}
-
-VisibleSelectionInFlatTree createVisibleSelection(
     const EphemeralRangeInFlatTree& range,
     TextAffinity affinity,
     bool isDirectional) {