Bug 1323702 - Support cloning XUL element style="" attributes in Servo-styled documents. r=bholley

MozReview-Commit-ID: Am2GjOCDVoe

--HG--
extra : rebase_source : 526acb17a154c0549f84631408b0a6ed0cd3004e

dom/xul/nsXULElement.cpp

@@ -381,8 +381,7 @@ nsXULElement::Clone(mozilla::dom::NodeInfo *aNodeInfo, nsINode **aResult) const
         // Style rules need to be cloned.
         if (originalValue->Type() == nsAttrValue::eCSSDeclaration) {
             DeclarationBlock* decl = originalValue->GetCSSDeclarationValue();
-            RefPtr<css::Declaration>
-              declClone = new css::Declaration(*decl->AsGecko());
+            RefPtr<DeclarationBlock> declClone = decl->Clone();
 
             nsString stringValue;
             originalValue->ToString(stringValue);
@@ -1918,8 +1917,7 @@ nsXULElement::MakeHeavyweight(nsXULPrototypeElement* aPrototype)
         // Style rules need to be cloned.
         if (protoattr->mValue.Type() == nsAttrValue::eCSSDeclaration) {
             DeclarationBlock* decl = protoattr->mValue.GetCSSDeclarationValue();
-            RefPtr<css::Declaration>
-              declClone = new css::Declaration(*decl->AsGecko());
+            RefPtr<DeclarationBlock> declClone = decl->Clone();
 
             nsString stringValue;
             protoattr->mValue.ToString(stringValue);

layout/mathml/crashtests/crashtests.list

@@ -51,7 +51,7 @@ load 443089-1.xhtml
 load 463763-1.xhtml
 load 463763-2.xhtml
 load 476547-1.xhtml
-skip-if(stylo) load 477740-1.xhtml # bug 1323702
+load 477740-1.xhtml
 load 541620-1.xhtml
 load 557474-1.html
 load 654928-1.html