[Editing] Store |CommandSource| in |CompositeEditCommand|

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

Index: third_party/WebKit/Source/core/editing/commands/UnlinkCommand.h
diff --git a/third_party/WebKit/Source/core/editing/commands/UnlinkCommand.h b/third_party/WebKit/Source/core/editing/commands/UnlinkCommand.h
index 91f6e42c135a8e2ec00b3f1cbe8600e2343fa61a..a352846c2232501cd3487599e91b0d31989da6f2 100644
--- a/third_party/WebKit/Source/core/editing/commands/UnlinkCommand.h
+++ b/third_party/WebKit/Source/core/editing/commands/UnlinkCommand.h
@@ -32,12 +32,12 @@ 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;
 };