Fix various inner classes now identified by the Blink GC plugin.

Source/core/css/parser/CSSPropertyParser.cpp

Index: Source/core/css/parser/CSSPropertyParser.cpp
diff --git a/Source/core/css/parser/CSSPropertyParser.cpp b/Source/core/css/parser/CSSPropertyParser.cpp
index d789b39fb7d88ef9f3672af8bb08475ea64cb903..33a8ee326883ec26da4a37db9bbe0a8b87fe8d1f 100644
--- a/Source/core/css/parser/CSSPropertyParser.cpp
+++ b/Source/core/css/parser/CSSPropertyParser.cpp
@@ -727,16 +727,19 @@ bool CSSPropertyParser::parseValue(CSSPropertyID propId, bool important)
         CSSPropertyID propId1, propId2;
         bool result = false;
         if (parseFillProperty(propId, propId1, propId2, val1, val2)) {
-            OwnPtr<ShorthandScope> shorthandScope;
             if (propId == CSSPropertyBackgroundPosition ||
                 propId == CSSPropertyBackgroundRepeat ||
                 propId == CSSPropertyWebkitMaskPosition ||
                 propId == CSSPropertyWebkitMaskRepeat) {
-                shorthandScope = adoptPtr(new ShorthandScope(this, propId));
+                ShorthandScope scope(this, propId);
+                addProperty(propId1, val1.release(), important);
+                if (val2)
+                    addProperty(propId2, val2.release(), important);
+            } else {
+                addProperty(propId1, val1.release(), important);
+                if (val2)
+                    addProperty(propId2, val2.release(), important);
             }
-            addProperty(propId1, val1.release(), important);
-            if (val2)
-                addProperty(propId2, val2.release(), important);
             result = true;
         }
         m_implicitShorthand = false;