Make CSSStyleRuleImpl immutable by changing mutation code (including some merging of code between nsDOMCSSAttributeDeclaration and DOMCSSDeclarationImpl) so that it creates a new rule for the modified declaration. Change StyleRuleChanged notification signatures, and change pres shell's handling of style rule change, addition, and removal to just do reresolution. Remove fine-grained ways of clearing style data. Change PeekStyleData so it doesn't do more work than it needs to, and can be relied on not to access rules that no longer match any content. b=188803 r+sr=bzbarsky

git-svn-id: svn://10.0.0.236/trunk@143831 18797224-902f-48f8-a5cc-f745e15eee43

mozilla/content/html/document/src/nsHTMLContentSink.cpp

@@ -5448,7 +5448,8 @@ HTMLContentSink::StyleSheetApplicableStateChanged(nsIDocument *aDocument,
 NS_IMETHODIMP
 HTMLContentSink::StyleRuleChanged(nsIDocument *aDocument,
                                   nsIStyleSheet* aStyleSheet,
-                                  nsIStyleRule* aStyleRule, nsChangeHint aHint)
+                                  nsIStyleRule* aOldStyleRule,
+                                  nsIStyleRule* aNewStyleRule)
 {
   return NS_OK;
 }