Remove redundant GYP variable conditions.
Remove redundant GYP variable conditions.

The refactoring in r241736 kept these redundant conditions.

BUG=329097

Review URL: https://codereview.chromium.org/1328153003

Cr-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#357681}

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