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

Source/modules/webdatabase/ChangeVersionData.h

Index: Source/modules/webdatabase/ChangeVersionData.h
diff --git a/Source/modules/webdatabase/ChangeVersionData.h b/Source/modules/webdatabase/ChangeVersionData.h
index 109ed9992f49ddf1c81d842b9cc65956e1161501..bf660fc8c9a6e6a2caafc9928eb85fc30bb59734 100644
--- a/Source/modules/webdatabase/ChangeVersionData.h
+++ b/Source/modules/webdatabase/ChangeVersionData.h
@@ -26,11 +26,13 @@
 #ifndef ChangeVersionData_h
 #define ChangeVersionData_h
 
+#include "wtf/Allocator.h"
 #include "wtf/text/WTFString.h"
 
 namespace blink {
 
 class ChangeVersionData {
+    STACK_ALLOCATED();
 public:
     ChangeVersionData(String oldVersion, String newVersion)
         : m_oldVersion(oldVersion), m_newVersion(newVersion) { }