[part 2] Make classes and structures in modules fast-allocated.

Source/modules/indexeddb/IDBKeyPath.h

Index: Source/modules/indexeddb/IDBKeyPath.h
diff --git a/Source/modules/indexeddb/IDBKeyPath.h b/Source/modules/indexeddb/IDBKeyPath.h
index a0799e180236a7f766bac991a7f3b21e2cf228a9..7f1cabc0d3a17c9bc4fccf667c56b06d3eaa6c60 100644
--- a/Source/modules/indexeddb/IDBKeyPath.h
+++ b/Source/modules/indexeddb/IDBKeyPath.h
@@ -29,6 +29,7 @@
 #include "bindings/modules/v8/UnionTypesModules.h"
 #include "modules/ModulesExport.h"
 #include "public/platform/modules/indexeddb/WebIDBKeyPath.h"
+#include "wtf/Allocator.h"
 #include "wtf/Vector.h"
 #include "wtf/text/WTFString.h"
 
@@ -42,6 +43,7 @@ enum IDBKeyPathParseError {
 MODULES_EXPORT void IDBParseKeyPath(const String&, Vector<String>&, IDBKeyPathParseError&);
 
 class MODULES_EXPORT IDBKeyPath {
+    DISALLOW_ALLOCATION();
 public:
     IDBKeyPath() : m_type(NullType) { }
     explicit IDBKeyPath(const String&);