Steps to reproduce the problem:
1. Checkout sources, configure android build, build chrome_public_apk
2. Change something in build/android/gyp/lint.py, in _OnStaleMd5. 
3. Build chrome_public_apk again

What is the expected behavior?
lint.py is run and produces error reports according to changes

What went wrong?
Something runs but actual lint tool isn't invoked and there are no errors.

Did this work before? N/A 

Chrome version: N/A  Channel: canary
OS Version: 
Flash Version: N/A

Lint.py computes md5 digest of all its inputs and skips actual linting if content of the inputs is up-to-date. But the content of the script itself isn't added to the digest, only path to the script.