Make explicit constant for num of CSSPropertyIDs

third_party/WebKit/Source/core/css/CSSPropertyIDTemplates.h

Index: third_party/WebKit/Source/core/css/CSSPropertyIDTemplates.h
diff --git a/third_party/WebKit/Source/core/css/CSSPropertyIDTemplates.h b/third_party/WebKit/Source/core/css/CSSPropertyIDTemplates.h
index 7c95cbe5c3be235ebdc0b384455b55db0336236b..b2e949e647ada173479d92103572422debc13759 100644
--- a/third_party/WebKit/Source/core/css/CSSPropertyIDTemplates.h
+++ b/third_party/WebKit/Source/core/css/CSSPropertyIDTemplates.h
@@ -19,11 +19,10 @@ struct HashTraits<blink::CSSPropertyID>
     : GenericHashTraits<blink::CSSPropertyID> {
   static const bool emptyValueIsZero = true;
   static void constructDeletedValue(blink::CSSPropertyID& slot, bool) {
-    slot =
-        static_cast<blink::CSSPropertyID>(blink::lastUnresolvedCSSProperty + 1);
+    slot = static_cast<blink::CSSPropertyID>(blink::numCSSPropertyIDs);
   }
   static bool isDeletedValue(blink::CSSPropertyID value) {
-    return value == (blink::lastUnresolvedCSSProperty + 1);
+    return value == blink::numCSSPropertyIDs;
   }
 };
 }  // namespace WTF