Bug 1347838 - stylo: Don't resolve images in nsStyleContentData objects twice. r=manishearth

MozReview-Commit-ID: 7KQykNEmZYp

--HG--
extra : rebase_source : 9a232112d5b377a59848e86657fca4d520e7bd2e

layout/style/nsStyleStruct.h

@@ -3238,7 +3238,7 @@ public:
   }
 
   void Resolve(nsPresContext* aPresContext) {
-    if (mType == eStyleContentType_Image) {
+    if (mType == eStyleContentType_Image && !mContent.mImage->IsResolved()) {
       mContent.mImage->Resolve(aPresContext);
     }
   }