Remove leftover Starboard 12 code (#837) (#839) #5

Job	Run time
android-arm / initialize	42s
android-arm64 / initialize	33s
android-x86 / initialize	33s
android-x86 / docker-build-image	31s
android-x86 / docker-unittest-image	0s
android-arm64 / docker-build-image	26s
android-arm64 / docker-unittest-image	0s
android-arm / docker-build-image	25s
android-arm / docker-unittest-image	0s
android-x86 / x86_devel	19m 56s
android-x86 / x86_debug	23m 46s
android-x86 / x86_qa	6m 56s
android-x86 / x86_gold	6m 42s
android-arm64 / arm64_devel	17m 59s
android-arm64 / arm64_debug	18m 3s
android-arm64 / arm64_qa	6m 24s
android-arm64 / arm64_gold	6m 44s
android-arm / arm_devel	18m 43s
android-arm / arm_debug	17m 2s
android-arm / arm_qa	6m 36s
android-arm / arm_gold	7m 12s
android-arm64 / ${{ matrix.name }}_${{ matrix.shard }}_test	0s
android-arm64 / ${{ matrix.name }}_on_device_${{ matrix.shard }}	0s
android-arm64 / on-host-unit-test-report	0s
android-arm / ${{ matrix.name }}_${{ matrix.shard }}_test	0s
android-arm / ${{ matrix.name }}_on_device_${{ matrix.shard }}	0s
android-arm / on-host-unit-test-report	0s
android-x86 / ${{ matrix.name }}_${{ matrix.shard }}_test	0s
android-x86 / ${{ matrix.name }}_on_device_${{ matrix.shard }}	0s
android-x86 / on-host-unit-test-report	0s
	2h 39m 13s

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