[Editing] Store |CommandSource| in |CompositeEditCommand|

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

Index: third_party/WebKit/Source/core/editing/commands/RemoveNodePreservingChildrenCommand.h
diff --git a/third_party/WebKit/Source/core/editing/commands/RemoveNodePreservingChildrenCommand.h b/third_party/WebKit/Source/core/editing/commands/RemoveNodePreservingChildrenCommand.h
index 5a9407d362fa3445d2589bfabcb4b5b95a6b808c..9199fd4d2fcf6c44f4604c0454cedc0f98439fa3 100644
--- a/third_party/WebKit/Source/core/editing/commands/RemoveNodePreservingChildrenCommand.h
+++ b/third_party/WebKit/Source/core/editing/commands/RemoveNodePreservingChildrenCommand.h
@@ -33,16 +33,18 @@ namespace blink {
 class RemoveNodePreservingChildrenCommand final : public CompositeEditCommand {
  public:
   static RemoveNodePreservingChildrenCommand* create(
+      CommandSource source,
       Node* node,
       ShouldAssumeContentIsAlwaysEditable shouldAssumeContentIsAlwaysEditable) {
     return new RemoveNodePreservingChildrenCommand(
-        node, shouldAssumeContentIsAlwaysEditable);
+        source, node, shouldAssumeContentIsAlwaysEditable);
   }
 
   DECLARE_VIRTUAL_TRACE();
 
  private:
-  RemoveNodePreservingChildrenCommand(Node*,
+  RemoveNodePreservingChildrenCommand(CommandSource,
+                                      Node*,
                                       ShouldAssumeContentIsAlwaysEditable);
 
   void doApply(EditingState*) override;