Unify and generalize thread static persistent finalization.

third_party/WebKit/Source/core/css/CSSValuePool.cpp

Index: third_party/WebKit/Source/core/css/CSSValuePool.cpp
diff --git a/third_party/WebKit/Source/core/css/CSSValuePool.cpp b/third_party/WebKit/Source/core/css/CSSValuePool.cpp
index 976975491817808808a111829a18feb2ba3473eb..35dae10735ee39430bc1f16b68edc9a09fb08a1b 100644
--- a/third_party/WebKit/Source/core/css/CSSValuePool.cpp
+++ b/third_party/WebKit/Source/core/css/CSSValuePool.cpp
@@ -38,8 +38,8 @@ CSSValuePool& cssValuePool()
     DEFINE_THREAD_SAFE_STATIC_LOCAL(ThreadSpecific<Persistent<CSSValuePool>>, threadSpecificPool, new ThreadSpecific<Persistent<CSSValuePool>>());
     Persistent<CSSValuePool>& poolHandle = *threadSpecificPool;
     if (!poolHandle) {
-        poolHandle = new CSSValuePool();
-        poolHandle.clearOnThreadShutdown();
+        poolHandle = new CSSValuePool;
+        poolHandle.registerAsStaticReference();
     }
     return *poolHandle;
 }