make: Remove a few unused imports.
make: Remove a few unused imports.

No behavior change.
Review URL: http://codereview.chromium.org/8636027
old8xp/gyp_from_google,old8xp/gyp_from_google,old8xp/gyp_from_google,old8xp/gyp_from_google,old8xp/gyp_from_google