Cherry pick PR #739: Fix memory leak where ref to JS callback was not being deleted #208

Job	Run time
android-arm / initialize	36s
android-arm64 / initialize	33s
android-x86 / initialize	34s
android-arm64 / docker-build-image	40s
android-arm64 / docker-unittest-image	0s
android-arm / docker-build-image	29s
android-arm / docker-unittest-image	0s
android-x86 / docker-build-image	38s
android-x86 / docker-unittest-image	0s
android-arm / arm_devel	25m 51s
android-arm / arm_debug	15m 38s
android-arm / arm_qa	7m 0s
android-arm / arm_gold	6m 28s
android-arm64 / arm64_devel	15m 19s
android-arm64 / arm64_debug	15m 46s
android-arm64 / arm64_qa	6m 46s
android-arm64 / arm64_gold	6m 27s
android-x86 / x86_devel	22m 17s
android-x86 / x86_debug	15m 39s
android-x86 / x86_qa	6m 40s
android-x86 / x86_gold	7m 11s
android-arm64 / ${{ matrix.name }}_on_device_${{ matrix.shard }}	0s
android-arm64 / ${{ matrix.name }}_${{ matrix.shard }}_test	0s
android-arm64 / on-host-unit-test-report	0s
android-x86 / ${{ matrix.name }}_on_device_${{ matrix.shard }}	0s
android-x86 / ${{ matrix.name }}_${{ matrix.shard }}_test	0s
android-x86 / 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
	2h 34m 32s

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