clean native_client_sdk chrome_frame third_party/{libexif,libmtp,opus}
clean third_party keeping only stuff really needed

727M    chromium-browser-24.0.1312.45/src
792M    chromium-browser-24.0.1312.45-noclean/src

the list came from archlinux PKGBUILD file
ensure linux_link_gsettings is off