Update libchromiumcontent with free version of ffmpeg

Author: zcbenz

script/lib/config.py

@@ -8,7 +8,7 @@
 
 BASE_URL = os.getenv('LIBCHROMIUMCONTENT_MIRROR') or \
     'https://s3.amazonaws.com/github-janky-artifacts/libchromiumcontent'
-LIBCHROMIUMCONTENT_COMMIT = 'fc5174471ccccce7030d0960f5228e73ca7c2ac6'
+LIBCHROMIUMCONTENT_COMMIT = '599c8941e1884e155218ec1013cba9fc5c7c7072'
 
 PLATFORM = {
   'cygwin': 'win32',