Have EditCommand classes deal with Document references, not pointers

Source/core/editing/DeleteSelectionCommand.h

Index: Source/core/editing/DeleteSelectionCommand.h
diff --git a/Source/core/editing/DeleteSelectionCommand.h b/Source/core/editing/DeleteSelectionCommand.h
index 22a54101fe67cca08911e694567f54ac766aeef6..8234bb308b3a734f610e767b035d279150fb9d27 100644
--- a/Source/core/editing/DeleteSelectionCommand.h
+++ b/Source/core/editing/DeleteSelectionCommand.h
@@ -34,7 +34,7 @@ class EditingStyle;
 
 class DeleteSelectionCommand : public CompositeEditCommand {
 public:
-    static PassRefPtr<DeleteSelectionCommand> create(Document* document, bool smartDelete = false, bool mergeBlocksAfterDelete = true, bool replace = false, bool expandForSpecialElements = false, bool sanitizeMarkup = true)
+    static PassRefPtr<DeleteSelectionCommand> create(Document& document, bool smartDelete = false, bool mergeBlocksAfterDelete = true, bool replace = false, bool expandForSpecialElements = false, bool sanitizeMarkup = true)
     {
         return adoptRef(new DeleteSelectionCommand(document, smartDelete, mergeBlocksAfterDelete, replace, expandForSpecialElements, sanitizeMarkup));
     }
@@ -44,7 +44,7 @@ public:
     }
 
 private:
-    DeleteSelectionCommand(Document*, bool smartDelete, bool mergeBlocksAfterDelete, bool replace, bool expandForSpecialElements, bool santizeMarkup);
+    DeleteSelectionCommand(Document&, bool smartDelete, bool mergeBlocksAfterDelete, bool replace, bool expandForSpecialElements, bool santizeMarkup);
     DeleteSelectionCommand(const VisibleSelection&, bool smartDelete, bool mergeBlocksAfterDelete, bool replace, bool expandForSpecialElements, bool sanitizeMarkup);
 
     virtual void doApply();