Oilpan: add missing RawPtr<> initialization following r355274.

third_party/WebKit/Source/core/animation/ImageListInterpolationType.cpp

Index: third_party/WebKit/Source/core/animation/ImageListInterpolationType.cpp
diff --git a/third_party/WebKit/Source/core/animation/ImageListInterpolationType.cpp b/third_party/WebKit/Source/core/animation/ImageListInterpolationType.cpp
index 07a6e500bc2922da3f05082f7e08750bd57e614a..84c35ca1dc5501a5b24fbefd81cbb9f4601c04ec 100644
--- a/third_party/WebKit/Source/core/animation/ImageListInterpolationType.cpp
+++ b/third_party/WebKit/Source/core/animation/ImageListInterpolationType.cpp
@@ -114,7 +114,7 @@ PassOwnPtr<InterpolationValue> ImageListInterpolationType::maybeConvertValue(con
     if (value.isPrimitiveValue() && toCSSPrimitiveValue(value).getValueID() == CSSValueNone)
         return nullptr;
 
-    RefPtrWillBeRawPtr<CSSValueList> tempList;
+    RefPtrWillBeRawPtr<CSSValueList> tempList = nullptr;
     if (!value.isBaseValueList()) {
         tempList = CSSValueList::createCommaSeparated();
         tempList->append(const_cast<CSSValue*>(&value)); // Take ref.