Bug 1220509 - Remove unused CSSStyleSheet::PrependStyleRule. r=bzbarsky

layout/style/CSSStyleSheet.cpp

@@ -1553,22 +1553,6 @@ CSSStyleSheet::InsertStyleSheetAt(CSSStyleSheet* aSheet, int32_t aIndex)
   DidDirty();
 }
 
-void
-CSSStyleSheet::PrependStyleRule(css::Rule* aRule)
-{
-  NS_PRECONDITION(nullptr != aRule, "null arg");
-
-  WillDirty();
-  mInner->mOrderedRules.InsertObjectAt(aRule, 0);
-  aRule->SetStyleSheet(this);
-  DidDirty();
-
-  if (css::Rule::NAMESPACE_RULE == aRule->GetType()) {
-    // no api to prepend a namespace (ugh), release old ones and re-create them all
-    mInner->RebuildNameSpaces();
-  }
-}
-
 void
 CSSStyleSheet::AppendStyleRule(css::Rule* aRule)
 {

layout/style/CSSStyleSheet.h

@@ -159,7 +159,6 @@ public:
   void InsertStyleSheetAt(CSSStyleSheet* aSheet, int32_t aIndex);
 
   // XXX do these belong here or are they generic?
-  void PrependStyleRule(css::Rule* aRule);
   void AppendStyleRule(css::Rule* aRule);
   void ReplaceStyleRule(css::Rule* aOld, css::Rule* aNew);