UserAgent: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/63.0.3239.108 Safari/537.36

Steps to reproduce the problem:
1. Build with systemwebp
2. Replace google with system webp
3. Bootstrap
4 Call gn
5 See it

What is the expected behavior?
Build it

What went wrong?
https://p.teknik.io/O286j

Did this work before? Yes 66.0.3329.1

Chrome version: 63.0.3239.108  Channel: canary
OS Version: 66.0.3330.0
Flash Version: 66.0.3329.1

libwebp 0.6.1