Bug 1059519. Relax assertion. r=mstange

--HG--
extra : commitid : 3juxKjI2Tv4
extra : rebase_source : 440f5dfacd13757cbd83931b7f059ee9c4edd827

layout/base/FrameLayerBuilder.cpp

@@ -4680,7 +4680,7 @@ ContainerState::Finish(uint32_t* aTextContentFlags, LayerManagerData* aData,
 {
   mPaintedLayerDataTree.Finish();
 
-  NS_ASSERTION(mContainerBounds.IsEqualInterior(mAccumulatedChildBounds),
+  NS_ASSERTION(mContainerBounds.Contains(mAccumulatedChildBounds),
                "Bounds computation mismatch");
 
   if (mLayerBuilder->IsBuildingRetainedLayers()) {