starboard/types.h: Remove kSbInvalidInt (#4386) #16525

Job	Run time
android-arm64 / initialize	1m 20s
android-arm / initialize	1m 17s
android-cobalt-arm64 / initialize	1m 17s
android-cobalt-arm / initialize	1m 19s
android-cobalt-x86 / initialize	1m 21s
android-x86 / initialize	1m 15s
android-x86 / docker-build-image	4m 29s
android-cobalt-arm64 / docker-build-image	3m 36s
android-arm / docker-build-image	3m 28s
android-arm64 / docker-build-image	4m 0s
android-cobalt-arm / docker-build-image	3m 45s
android-cobalt-x86 / docker-build-image	3m 37s
android-arm / arm_devel	32m 11s
android-arm / arm_debug	21s
android-arm / arm_qa	32m 2s
android-arm / arm_gold	41m 25s
android-cobalt-arm64 / arm64_devel	56m 35s
android-cobalt-arm64 / arm64_debug	21s
android-cobalt-arm64 / arm64_qa	53m 45s
android-cobalt-arm64 / arm64_gold	50m 14s
android-cobalt-x86 / x86_devel	34m 36s
android-cobalt-x86 / x86_debug	23s
android-cobalt-x86 / x86_qa	33m 17s
android-cobalt-x86 / x86_gold	36m 0s
android-cobalt-arm / arm_devel	33m 15s
android-cobalt-arm / arm_debug	24s
android-cobalt-arm / arm_qa	33m 6s
android-cobalt-arm / arm_gold	45m 22s
android-arm64 / arm64_devel	49m 18s
android-arm64 / arm64_debug	21s
android-arm64 / arm64_qa	49m 51s
android-arm64 / arm64_gold	49m 31s
android-x86 / x86_devel	31m 31s
android-x86 / x86_debug	21s
android-x86 / x86_qa	32m 31s
android-x86 / x86_gold	32m 22s
	12h 39m 47s

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