Worked on the denoland/chromium_build repository to enhance build-system hygiene by introducing a build-time warning for the IS_DESKTOP_ANDROID flag in build.gn. This update aimed to guide developers toward using runtime detection instead of relying on build-time flags, reserving IS_DESKTOP_ANDROID for cases where binary size is notably affected. The approach focused on improving maintainability and reducing support overhead by providing clear guidance and directing questions to the appropriate mailing list. Leveraged GN language and build system configuration skills to implement these changes, resulting in a quality-of-life improvement that promotes consistency and best practices across the build process.