Oilpan build fix for r174893 and r174900.

Source/core/animation/interpolation/DeferredLegacyStyleInterpolation.cpp

Index: Source/core/animation/interpolation/DeferredLegacyStyleInterpolation.cpp
diff --git a/Source/core/animation/interpolation/DeferredLegacyStyleInterpolation.cpp b/Source/core/animation/interpolation/DeferredLegacyStyleInterpolation.cpp
index 34be5a04027fe0d448cfde64c3c21af5bcd634b6..f7824cb142207a7944d1add6b072810d465d262a 100644
--- a/Source/core/animation/interpolation/DeferredLegacyStyleInterpolation.cpp
+++ b/Source/core/animation/interpolation/DeferredLegacyStyleInterpolation.cpp
@@ -144,9 +144,9 @@ bool DeferredLegacyStyleInterpolation::interpolationRequiresStyleResolve(const C
 
 void DeferredLegacyStyleInterpolation::trace(Visitor* visitor)
 {
-    StyleInterpolation::trace(visitor);
     visitor->trace(m_startCSSValue);
     visitor->trace(m_endCSSValue);
+    StyleInterpolation::trace(visitor);
 }
 
 }