fixing compilation problems with new nsCOMPtr. part of the carpool.

editor/base/DeleteRangeTxn.cpp

editor/base/InsertTextTxn.cpp

editor/base/nsEditor.cpp

editor/base/nsEditorEventListeners.cpp

editor/libeditor/base/DeleteRangeTxn.cpp

editor/libeditor/base/InsertTextTxn.cpp

editor/libeditor/base/nsEditor.cpp

editor/libeditor/text/nsEditorEventListeners.cpp