UserAgent: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/66.0.3359.106 Safari/537.36

Steps to reproduce the problem:
1. Bootstrap GN
2. Build rulefiles
3. See it fails

What is the expected behavior?
Build it 

What went wrong?
[410/410] LINK gn
Building gn using itself to out/Release...
Done. Made 7617 targets from 1460 files in 3016ms
ninja: Entering directory `src/chromium-66.0.3359.117/out/Release'
[511/511] LINK ./gn
Done. Made 7617 targets from 1460 files in 2704ms
Done. Made 7617 targets from 1460 files in 2705ms
ninja: Entering directory `out/Release'
ninja: error: '../../third_party/blink/tools/blinkpy/common/name_style_converter.py', needed by 'gen/blink/bindings/core/v8/add_event_listener_options_or_boolean.cc', missing and no known rule to make it

Did this work before? Yes 66.0.3359.81

Chrome version: 66.0.3359.106  Channel: stable
OS Version: 66.0.3359.117
Flash Version: