Cheaper thread-safe atomic initialization of static references.

Source/modules/indexeddb/IDBDatabase.cpp

Index: Source/modules/indexeddb/IDBDatabase.cpp
diff --git a/Source/modules/indexeddb/IDBDatabase.cpp b/Source/modules/indexeddb/IDBDatabase.cpp
index 3072927d15fd1579eb9a5f5b97fd17190482768e..c6fd7cb3d7b7be007f94d4030c58c63bee96ec60 100644
--- a/Source/modules/indexeddb/IDBDatabase.cpp
+++ b/Source/modules/indexeddb/IDBDatabase.cpp
@@ -107,7 +107,7 @@ int64_t IDBDatabase::nextTransactionId()
 {
     // Only keep a 32-bit counter to allow ports to use the other 32
     // bits of the id.
-    AtomicallyInitializedStatic(int, currentTransactionId = 0);
+    static int currentTransactionId = 0;
     return atomicIncrement(&currentTransactionId);
 }