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 658a3ad32a1b23d969fbf7dd6f133664c2bbf13f..c21315adf2d10b0f3f59f698def68485a3e13a5e 100644
--- a/Source/core/rendering/RenderLayer.cpp
+++ b/Source/core/rendering/RenderLayer.cpp
@@ -2723,7 +2723,7 @@ 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());
@@ -2762,7 +2762,7 @@ void RenderLayer::updateOrRemoveFilterEffectRenderer()
 
     RenderLayerFilterInfo* filterInfo = ensureFilterInfo();
     if (!filterInfo->renderer()) {
-        RefPtr<FilterEffectRenderer> filterRenderer = FilterEffectRenderer::create();
+        RefPtrWillBeRawPtr<FilterEffectRenderer> filterRenderer = FilterEffectRenderer::create();
         filterInfo->setRenderer(filterRenderer.release());
     }