Have EditCommand classes deal with Document references, not pointers

Source/core/editing/RemoveFormatCommand.h

Index: Source/core/editing/RemoveFormatCommand.h
diff --git a/Source/core/editing/RemoveFormatCommand.h b/Source/core/editing/RemoveFormatCommand.h
index d8032ea6aff269701967686cd5d60b69daadfc50..f6d030d9187e407ee8b6836e2b1c8fba213c51bb 100644
--- a/Source/core/editing/RemoveFormatCommand.h
+++ b/Source/core/editing/RemoveFormatCommand.h
@@ -32,13 +32,13 @@ namespace WebCore {
 
 class RemoveFormatCommand : public CompositeEditCommand {
 public:
-    static PassRefPtr<RemoveFormatCommand> create(Document* document)
+    static PassRefPtr<RemoveFormatCommand> create(Document& document)
     {
         return adoptRef(new RemoveFormatCommand(document));
     }
 
 private:
-    explicit RemoveFormatCommand(Document*);
+    explicit RemoveFormatCommand(Document&);
 
     virtual void doApply();
     virtual EditAction editingAction() const { return EditActionUnspecified; }