EnterReflowLock();
WillCauseReflow();
PresShell::StyleRuleChanged(nsIDocument *aDocument,                            nsIStyleSheet* aStyleSheet,                            nsIStyleRule* aStyleRule,                            PRInt32 aHint) {  EnterReflowLock();  nsresult  rv = mStyleSet->StyleRuleChanged(mPresContext, aStyleSheet,                                             aStyleRule, aHint);  VERIFY_STYLE_TREE;  ExitReflowLock(PR_TRUE);  return rv;}