[draft12] Send explicit disable of compressed data, just to be sure.
[draft12] add comment requested by review
[draft12] Properly bounds-check the new priority value.
[draft12] Instead of setting new weight from the server, just log.
[draft12] Remove sending of BLOCKED frames, since my implementation may not adhere to spec
[draft12] New telemetry value for new implementation draft.
Bug 1001022 (part 2) - Update unit tests for http2 draft12. r=mcmanus
Bug 1003320 - Send HPACK buffer size updates when receiving SETTINGS_HEADER_TABLE_SIZE. r=mcmanus