Oilpan: move SVG property hierarchy to the heap.

Source/core/rendering/RenderLayer.cpp

Index: Source/core/rendering/RenderLayer.cpp
diff --git a/Source/core/rendering/RenderLayer.cpp b/Source/core/rendering/RenderLayer.cpp
index ba9c9160db2976b1d391d06894bc2f66cab7d88d..cf260a676b96a5154fcef390e625475fa2afd467 100644
--- a/Source/core/rendering/RenderLayer.cpp
+++ b/Source/core/rendering/RenderLayer.cpp
@@ -2739,7 +2739,7 @@ FilterOperations RenderLayer::computeFilterOperations(const RenderStyle* style)
                 continue;
             ReferenceFilterOperation* referenceOperation = toReferenceFilterOperation(filterOperation);
             // FIXME: Cache the ReferenceFilter if it didn't change.
-            RefPtr<ReferenceFilter> referenceFilter = ReferenceFilter::create(style->effectiveZoom());
+            RefPtrWillBeRawPtr<ReferenceFilter> referenceFilter = ReferenceFilter::create(style->effectiveZoom());
             referenceFilter->setLastEffect(ReferenceFilterBuilder::build(referenceFilter.get(), renderer(), referenceFilter->sourceGraphic(),
                 referenceOperation));
             referenceOperation->setFilter(referenceFilter.release());
@@ -2778,7 +2778,7 @@ void RenderLayer::updateOrRemoveFilterEffectRenderer()
 
     RenderLayerFilterInfo* filterInfo = ensureFilterInfo();
     if (!filterInfo->renderer()) {
-        RefPtr<FilterEffectRenderer> filterRenderer = FilterEffectRenderer::create();
+        RefPtrWillBeRawPtr<FilterEffectRenderer> filterRenderer = FilterEffectRenderer::create();
         filterInfo->setRenderer(filterRenderer.release());
     }