Cherry pick PR #3015: Revert "Delete the callback before the mMediaCodec is set to null." #2034

Job	Run time
raspi-2 / initialize	32s
raspi-2-skia / initialize	34s
raspi-2 / docker-build-image	27s
raspi-2 / docker-unittest-image	0s
raspi-2-skia / docker-build-image	28s
raspi-2-skia / docker-unittest-image	0s
raspi-2 / raspi_devel	8m 10s
raspi-2 / raspi_debug	12m 34s
raspi-2 / raspi_qa	7m 7s
raspi-2 / raspi_gold	6m 52s
raspi-2 / sbversion-15_devel	7m 58s
raspi-2 / sbversion-15_debug	13m 23s
raspi-2 / sbversion-15_qa	7m 43s
raspi-2 / sbversion-15_gold	7m 11s
raspi-2-skia / raspi-2-skia_devel	8m 11s
raspi-2-skia / raspi-2-skia_debug	13m 11s
raspi-2-skia / raspi-2-skia_qa	7m 40s
raspi-2-skia / raspi-2-skia_gold	6m 58s
raspi-2-skia / ${{ matrix.name }}_on_device_${{ matrix.shard }}	0s
raspi-2-skia / ${{ matrix.name }}_${{ matrix.shard }}_test	0s
raspi-2-skia / on-host-unit-test-report	0s
raspi-2 / ${{ matrix.name }}_on_device_${{ matrix.shard }}	0s
raspi-2 / ${{ matrix.name }}_${{ matrix.shard }}_test	0s
raspi-2 / on-host-unit-test-report	0s
	1h 48m 59s

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