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This is because they are only available/needed on chromeos.

On my local test setup, I see a reduction of 6672 bytes in chrome binary:

gn gen out/Release --args=' use_goma=true is_clang=true \
is_component_build=true proprietary_codecs=true ffmpeg_branding="Chrome" \
safe_browsing_mode=1 enable_google_now=true is_debug=false \
dcheck_always_on=true '

ninja -C out/Release chrome

With this change:
ls -al out/Release/chrome:
-rwxr-x--- 1 lazyboy eng 61439904 Sep 15 16:03 out/Release/chrome
Without this change:
ls -al out/Release/chrome:
-rwxr-x--- 1 lazyboy eng 61446576 Sep 15 16:04 out/Release/chrome

BUG=376319
Test=Expect no visible change.

Review-Url: https://codereview.chromium.org/2344783004
Cr-Commit-Position: refs/heads/master@{#419356}