Remove starboard dep on cobalt/build/contents_dir.gni #15412

Job	Run time
raspi-2 / initialize	48s
raspi-2-skia / initialize	47s
raspi-2-skia / docker-build-image	1m 45s
raspi-2-skia / docker-unittest-image	0s
raspi-2 / docker-build-image	1m 46s
raspi-2 / docker-unittest-image	0s
raspi-2-skia / raspi-2-skia_devel	10m 12s
raspi-2-skia / raspi-2-skia_debug	13m 57s
raspi-2-skia / raspi-2-skia_qa	9m 8s
raspi-2-skia / raspi-2-skia_gold	9m 29s
raspi-2 / raspi_devel	10m 9s
raspi-2 / raspi_debug	14m 31s
raspi-2 / raspi_qa	9m 33s
raspi-2 / raspi_gold	8m 25s
raspi-2 / sbversion-17_devel	10m 1s
raspi-2 / sbversion-17_debug	14m 58s
raspi-2 / sbversion-17_qa	9m 7s
raspi-2 / sbversion-17_gold	9m 1s
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
	2h 13m 37s

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