Cherry pick PR #2118: Fix the persistent_cookie blackbox test. #1730

Job	Run time
raspi-2 / initialize	29s
raspi-2-skia / initialize	31s
raspi-2 / docker-build-image	32s
raspi-2 / docker-unittest-image	0s
raspi-2-skia / docker-build-image	33s
raspi-2-skia / docker-unittest-image	0s
raspi-2 / raspi_devel	7m 54s
raspi-2 / raspi_debug	12m 10s
raspi-2 / raspi_qa	7m 54s
raspi-2 / raspi_gold	6m 44s
raspi-2 / sbversion-15_devel	7m 46s
raspi-2 / sbversion-15_debug	12m 8s
raspi-2 / sbversion-15_qa	6m 50s
raspi-2 / sbversion-15_gold	6m 51s
raspi-2-skia / raspi-2-skia_devel	7m 51s
raspi-2-skia / raspi-2-skia_debug	12m 29s
raspi-2-skia / raspi-2-skia_qa	7m 30s
raspi-2-skia / raspi-2-skia_gold	7m 2s
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
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
	1h 45m 14s

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