Revert of [Editing] Introduce |EditCommandComposition::willUn/Reapply()| in prepare for (2/3)

third_party/WebKit/Source/core/editing/commands/UndoStack.h

Index: third_party/WebKit/Source/core/editing/commands/UndoStack.h
diff --git a/third_party/WebKit/Source/core/editing/commands/UndoStack.h b/third_party/WebKit/Source/core/editing/commands/UndoStack.h
index 2ed2a5847c0a56d9f3c87bd0c70244d01ed7014a..8f7e3c837d17fa4cdb9c5a298650be0ea64925d0 100644
--- a/third_party/WebKit/Source/core/editing/commands/UndoStack.h
+++ b/third_party/WebKit/Source/core/editing/commands/UndoStack.h
@@ -37,7 +37,6 @@
 
 namespace blink {
 
-enum class EditCommandSource;
 class LocalFrame;
 class UndoStep;
 
@@ -53,8 +52,8 @@
   void registerRedoStep(UndoStep*);
   bool canUndo() const;
   bool canRedo() const;
-  void undo(EditCommandSource);
-  void redo(EditCommandSource);
+  void undo();
+  void redo();
   void clear();
 
   DECLARE_TRACE();