Have EditCommand classes deal with Document references, not pointers

Source/core/editing/CreateLinkCommand.h

Index: Source/core/editing/CreateLinkCommand.h
diff --git a/Source/core/editing/CreateLinkCommand.h b/Source/core/editing/CreateLinkCommand.h
index cfe9c99336e14a8a4e805bd42569dbf758cb7775..af489feb7e01eaefece19e4c27b0cf17dd498090 100644
--- a/Source/core/editing/CreateLinkCommand.h
+++ b/Source/core/editing/CreateLinkCommand.h
@@ -32,7 +32,7 @@ namespace WebCore {
 
 class CreateLinkCommand : public CompositeEditCommand {
 public:
-    static PassRefPtr<CreateLinkCommand> create(Document* document, const String& linkURL)
+    static PassRefPtr<CreateLinkCommand> create(Document& document, const String& linkURL)
     {
         return adoptRef(new CreateLinkCommand(document, linkURL));
     }
@@ -40,7 +40,7 @@ public:
     bool isCreateLinkCommand() const { return true; }
 
 private:
-    CreateLinkCommand(Document*, const String& linkURL);
+    CreateLinkCommand(Document&, const String& linkURL);
 
     virtual void doApply();
     virtual EditAction editingAction() const { return EditActionCreateLink; }