Motiviation:
691bc1690e made writeUtf8 consistent with String.getBytes() so that it never throws.
94f27be59b provided a writeUtf8 method which takes a ByteBufAllocator to do an appropriately sized buffer allocation.
Result:
- Assume writeUtf8 will not throw in HTTP/2 codec
- Use the new writeUtf8 method
Result:
Cleaner code in codec-http2.