As written in this guideline (https://docs.google.com/document/d/1aitSOucL0VHZa9Z2vbRJSyAIsAz24kX8LFByQ5xQnUg/edit#heading=h.ekwf97my4bgf), Blink objects should be allocated on Oilpan or PartitionAlloc. They should not be allocated on malloc.

This means that classes that are not GarbageCollected should have the USING_FAST_MALLOC macro (to allocate the objects on the FastMalloc partition of PartitionAlloc).

We should add USING_FAST_MALLOC on classes where the macro is missing.

Complexity: Easy