Oilpan: add missing pointer initialization following r362974.

third_party/WebKit/Source/core/css/parser/CSSPropertyParser.cpp

Index: third_party/WebKit/Source/core/css/parser/CSSPropertyParser.cpp
diff --git a/third_party/WebKit/Source/core/css/parser/CSSPropertyParser.cpp b/third_party/WebKit/Source/core/css/parser/CSSPropertyParser.cpp
index db1044f75c85b44c0025105ebc2c5274747c4f2a..f7d85192a4c1635707a1a137d42d8ecccab73255 100644
--- a/third_party/WebKit/Source/core/css/parser/CSSPropertyParser.cpp
+++ b/third_party/WebKit/Source/core/css/parser/CSSPropertyParser.cpp
@@ -2213,7 +2213,7 @@ PassRefPtrWillBeRawPtr<CSSValue> CSSPropertyParser::consumeCursor(CSSParserToken
         else if (id == CSSValueWebkitZoomOut)
             m_context.useCounter()->count(UseCounter::PrefixedCursorZoomOut);
     }
-    RefPtrWillBeRawPtr<CSSValue> cursorType;
+    RefPtrWillBeRawPtr<CSSValue> cursorType = nullptr;
     if (id == CSSValueHand) {
         if (inQuirksMode()) // Non-standard behavior
             cursorType = cssValuePool().createIdentifierValue(CSSValuePointer);