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This allows other projects like ANGLE to import protobuf and use the
GN files without importing the JS dependencies.

Bug: angleproject:5161
Change-Id: I71b08c7c03a63a186312edee0a4b55e95e75cf69
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2464426
Commit-Queue: Peter Kasting <pkasting@chromium.org>
Reviewed-by: Peter Kasting <pkasting@chromium.org>
Cr-Commit-Position: refs/heads/master@{#816251}