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Otherwise, on Windows when 'All' is built the no-op build is broken --
no files are included in the .lib so none is generated, which means on
subsequent builds ninja always reruns that step.

This is currently breaking win_chromium_compile_dbg_ng trybots.

R=pasko@chromium.org, thakis@chromium.org
BUG=424562

Review URL: https://codereview.chromium.org/981623002

Cr-Commit-Position: refs/heads/master@{#319119}