[Editing] Store |CommandSource| in |CompositeEditCommand|

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

 /*
  * Copyright (C) 2006, 2008 Apple Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 14 matching lines @@
 
 #ifndef UnlinkCommand_h
 #define UnlinkCommand_h
 
 #include "core/editing/commands/CompositeEditCommand.h"
 
 namespace blink {
 
 class UnlinkCommand final : public CompositeEditCommand {
  public:
-  static UnlinkCommand* create(Document& document) {
-    return new UnlinkCommand(document);
+  static UnlinkCommand* create(Document& document, CommandSource source) {
+    return new UnlinkCommand(document, source);
   }
 
  private:
-  explicit UnlinkCommand(Document&);
+  UnlinkCommand(Document&, CommandSource);
 
   void doApply(EditingState*) override;
 };
 
 }  // namespace blink
 
 #endif  // UnlinkCommand_h