Cherry pick PR #1735: Fix GN on modular builds #1722

Job	Run time
linux-clang-3-9 / initialize	34s
linux-modular / initialize	33s
linux-x64 / initialize	39s
linux-gcc-6-3 / initialize	35s
linux-clang-3-9 / docker-build-image	31s
linux-clang-3-9 / docker-unittest-image	25s
linux-modular / docker-build-image	28s
linux-modular / docker-unittest-image	26s
linux-gcc-6-3 / docker-build-image	23s
linux-gcc-6-3 / docker-unittest-image	0s
linux-x64 / docker-build-image	27s
linux-x64 / docker-unittest-image	23s
linux-gcc-6-3 / ${{ matrix.name }}_${{ matrix.config }}	0s
linux-modular / ${{ matrix.name }}_${{ matrix.config }}	0s
linux-x64 / ${{ matrix.name }}_${{ matrix.config }}	0s
linux-clang-3-9 / ${{ matrix.name }}_${{ matrix.config }}	0s
linux-gcc-6-3 / ${{ matrix.name }}_on_device_${{ matrix.shard }}	0s
linux-gcc-6-3 / ${{ matrix.name }}_${{ matrix.shard }}_test	0s
linux-modular / ${{ matrix.name }}_${{ matrix.shard }}_test	0s
linux-modular / ${{ matrix.name }}_on_device_${{ matrix.shard }}	0s
linux-x64 / ${{ matrix.name }}_on_device_${{ matrix.shard }}	0s
linux-x64 / ${{ matrix.name }}_${{ matrix.shard }}_test	0s
linux-clang-3-9 / ${{ matrix.name }}_${{ matrix.shard }}_test	0s
linux-clang-3-9 / ${{ matrix.name }}_on_device_${{ matrix.shard }}	0s
linux-gcc-6-3 / on-host-unit-test-report	2s
linux-modular / on-host-unit-test-report	2s
linux-x64 / on-host-unit-test-report	3s
linux-clang-3-9 / on-host-unit-test-report	3s
	5m 34s

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