Bug 1765832 - Part 3: Remove AutoSelectionSetterAfterTableEdit::CancelSetCaret r=masayuki

The comment is lying as nothing actually uses it.

Differential Revision: https://phabricator.services.mozilla.com/D146631

editor/libeditor/HTMLTableEditor.cpp

@@ -51,8 +51,8 @@ using EmptyCheckOption = HTMLEditUtils::EmptyCheckOption;
  */
 class MOZ_STACK_CLASS AutoSelectionSetterAfterTableEdit final {
  private:
-  MOZ_KNOWN_LIVE RefPtr<HTMLEditor> mHTMLEditor;
-  MOZ_KNOWN_LIVE RefPtr<Element> mTable;
+  const RefPtr<HTMLEditor> mHTMLEditor;
+  const RefPtr<Element> mTable;
   int32_t mCol, mRow, mDirection, mSelected;
 
  public:
@@ -72,13 +72,6 @@ class MOZ_STACK_CLASS AutoSelectionSetterAfterTableEdit final {
                                               mSelected);
     }
   }
-
-  // This is needed to abort the caret reset in the destructor
-  // when one method yields control to another
-  void CancelSetCaret() {
-    mHTMLEditor = nullptr;
-    mTable = nullptr;
-  }
 };
 
 /******************************************************************************