Ensure QuicChromiumPacketWriter isn't still tracked when deleted. #1812

Job	Run time
raspi-2 / initialize	46s
raspi-2-skia / initialize	46s
raspi-2-skia / docker-build-image	3m 13s
raspi-2-skia / docker-unittest-image	0s
raspi-2 / docker-build-image	3m 20s
raspi-2 / docker-unittest-image	0s
raspi-2-skia / raspi-2-skia_devel	11m 20s
raspi-2-skia / raspi-2-skia_debug	16m 19s
raspi-2-skia / raspi-2-skia_qa	11m 35s
raspi-2-skia / raspi-2-skia_gold	9m 47s
raspi-2 / raspi_devel	11m 21s
raspi-2 / raspi_debug	16m 24s
raspi-2 / raspi_qa	11m 3s
raspi-2 / raspi_gold	9m 49s
raspi-2 / sbversion-15_devel	11m 15s
raspi-2 / sbversion-15_debug	15m 8s
raspi-2 / sbversion-15_qa	10m 2s
raspi-2 / sbversion-15_gold	10m 13s
raspi-2 / sbversion-16_devel	11m 5s
raspi-2 / sbversion-16_debug	18m 10s
raspi-2 / sbversion-16_qa	9m 53s
raspi-2 / sbversion-16_gold	9m 43s
raspi-2-skia / ${{ matrix.name }}_${{ matrix.shard }}_test	0s
raspi-2-skia / ${{ matrix.name }}_on_device_${{ matrix.shard }}	0s
raspi-2 / ${{ matrix.name }}_${{ matrix.shard }}_test	0s
raspi-2 / ${{ matrix.name }}_on_device_${{ matrix.shard }}	0s
	3h 21m 12s

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