Make DragCaretController store PositionWithAffinity instead of VisiblePosition

third_party/WebKit/Source/core/editing/DragCaretController.h

Index: third_party/WebKit/Source/core/editing/DragCaretController.h
diff --git a/third_party/WebKit/Source/core/editing/DragCaretController.h b/third_party/WebKit/Source/core/editing/DragCaretController.h
index 5daa044781811e2bf67a624bb5bcde73830e04ea..f6a48e750f3391f8dbcbd7aeee24bd1bf5be50c4 100644
--- a/third_party/WebKit/Source/core/editing/DragCaretController.h
+++ b/third_party/WebKit/Source/core/editing/DragCaretController.h
@@ -43,7 +43,7 @@ class DragCaretController final
   bool isContentRichlyEditable() const;
 
   bool hasCaret() const { return m_position.isNotNull(); }
-  const VisiblePosition& caretPosition() { return m_position; }
+  const PositionWithAffinity& caretPosition() { return m_position; }
   void setCaretPosition(const PositionWithAffinity&);
   void clear() { setCaretPosition(PositionWithAffinity()); }
 
@@ -54,7 +54,7 @@ class DragCaretController final
  private:
   DragCaretController();
 
-  VisiblePosition m_position;
+  PositionWithAffinity m_position;
   const Member<CaretBase> m_caretBase;
 };