--- a/layout/style/nsStyleStruct.cpp
+++ b/layout/style/nsStyleStruct.cpp
@@ -44,59 +44,32 @@ using namespace mozilla;
 static_assert((((1 << nsStyleStructID_Length) - 1) &
                ~(NS_STYLE_INHERIT_MASK)) == 0,
               "Not enough bits in NS_STYLE_INHERIT_MASK");
 
 /* static */ const int32_t nsStyleGridLine::kMinLine;
 /* static */ const int32_t nsStyleGridLine::kMaxLine;
 
 static bool
-EqualURIs(nsIURI *aURI1, nsIURI *aURI2)
-{
-  bool eq;
-  return aURI1 == aURI2 ||    // handle null==null, and optimize
-         (aURI1 && aURI2 &&
-          NS_SUCCEEDED(aURI1->Equals(aURI2, &eq)) && // not equal on fail
-          eq);
-}
-
-static bool
 DefinitelyEqualURIs(css::URLValueData* aURI1,
                     css::URLValueData* aURI2)
 {
   return aURI1 == aURI2 ||
          (aURI1 && aURI2 && aURI1->DefinitelyEqualURIs(*aURI2));
 }
 
 static bool
 DefinitelyEqualURIsAndPrincipal(css::URLValueData* aURI1,
                                 css::URLValueData* aURI2)
 {
   return aURI1 == aURI2 ||
          (aURI1 && aURI2 && aURI1->DefinitelyEqualURIsAndPrincipal(*aURI2));
 }
 
 static bool
-EqualImages(imgIRequest *aImage1, imgIRequest* aImage2)
-{
-  if (aImage1 == aImage2) {
-    return true;
-  }
-
-  if (!aImage1 || !aImage2) {
-    return false;
-  }
-
-  nsCOMPtr<nsIURI> uri1, uri2;
-  aImage1->GetURI(getter_AddRefs(uri1));
-  aImage2->GetURI(getter_AddRefs(uri2));
-  return EqualURIs(uri1, uri2);
-}
-
-static bool
 DefinitelyEqualImages(nsStyleImageRequest* aRequest1,
                       nsStyleImageRequest* aRequest2)
 {
   if (aRequest1 == aRequest2) {
     return true;
   }
 
   if (!aRequest1 || !aRequest2) {