Make PropertyReference value() return a const CSSValue&

third_party/WebKit/Source/core/frame/FrameSerializer.cpp

Index: third_party/WebKit/Source/core/frame/FrameSerializer.cpp
diff --git a/third_party/WebKit/Source/core/frame/FrameSerializer.cpp b/third_party/WebKit/Source/core/frame/FrameSerializer.cpp
index 5084c241fe5710a0a2637f07fe14d98128d0db04..802459fda57755dfe51ed12622f2748b19724920 100644
--- a/third_party/WebKit/Source/core/frame/FrameSerializer.cpp
+++ b/third_party/WebKit/Source/core/frame/FrameSerializer.cpp
@@ -430,8 +430,8 @@ void FrameSerializer::retrieveResourcesForProperties(const StylePropertySet* sty
     // image properties there might be.
     unsigned propertyCount = styleDeclaration->propertyCount();
     for (unsigned i = 0; i < propertyCount; ++i) {
-        const CSSValue* cssValue = styleDeclaration->propertyAt(i).value();
-        retrieveResourcesForCSSValue(*cssValue, document);
+        const CSSValue& cssValue = styleDeclaration->propertyAt(i).value();
+        retrieveResourcesForCSSValue(cssValue, document);
     }
 }