UserAgent: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Ubuntu Chromium/57.0.2987.98 Chrome/57.0.2987.98 Safari/537.36

Steps to reproduce the problem:
Build Latest chromium on Ubuntu 16.10.

What is the expected behavior?

What went wrong?
[23:16:08] ➜  src git:(757e34b)  ninja -C out/Default chrome
ninja: Entering directory `out/Default'
[5227/31265] ACTION //third_party/catapult/tracing:generate_about_tracing(//build/toolchain/linux:clang_x64)
FAILED: gen/content/browser/tracing/about_tracing.js gen/content/browser/tracing/about_tracing.html 
python ../../third_party/catapult/tracing/bin/generate_about_tracing_contents --outdir gen/content/browser/tracing
Traceback (most recent call last):
  File "../../third_party/catapult/tracing/bin/generate_about_tracing_contents", line 14, in <module>
    sys.exit(generate_about_tracing_contents.Main(sys.argv[1:]))
  File "/mnt/bcache/mnt/sda/d33tah/workspace/src/chromium/chromium/src/third_party/catapult/tracing/tracing_build/generate_about_tracing_contents.py", line 46, in Main
    minify=not args.no_min)
  File "/mnt/bcache/mnt/sda/d33tah/workspace/src/chromium/chromium/src/third_party/catapult/third_party/py_vulcanize/py_vulcanize/generate.py", line 255, in GenerateStandaloneHTMLToFile
    module.AppendHTMLContentsToFile(output_file, controller, minify=minify)
  File "/mnt/bcache/mnt/sda/d33tah/workspace/src/chromium/chromium/src/third_party/catapult/third_party/py_vulcanize/py_vulcanize/html_module.py", line 71, in AppendHTMLContentsToFile
    for piece in self._parser_results.YieldHTMLInPieces(ctl, minify=minify):
  File "/mnt/bcache/mnt/sda/d33tah/workspace/src/chromium/chromium/src/third_party/catapult/third_party/py_vulcanize/py_vulcanize/parse_html_deps.py", line 126, in YieldHTMLInPieces
    yield self.GenerateHTML(controller, minify)
  File "/mnt/bcache/mnt/sda/d33tah/workspace/src/chromium/chromium/src/third_party/catapult/third_party/py_vulcanize/py_vulcanize/parse_html_deps.py", line 129, in GenerateHTML
    soup = _CreateSoupWithoutHeadOrBody(unicode(self._soup))
  File "/mnt/bcache/mnt/sda/d33tah/workspace/src/chromium/chromium/src/third_party/catapult/third_party/py_vulcanize/py_vulcanize/parse_html_deps.py", line 79, in _CreateSoupWithoutHeadOrBody
    soup = bs4.BeautifulSoup()
  File "/mnt/bcache/mnt/sda/d33tah/workspace/src/chromium/chromium/src/third_party/catapult/third_party/beautifulsoup4/bs4/__init__.py", line 193, in __init__
    self.builder.prepare_markup(markup, from_encoding)):
  File "/mnt/bcache/mnt/sda/d33tah/workspace/src/chromium/chromium/src/third_party/catapult/third_party/beautifulsoup4/bs4/builder/_lxml.py", line 99, in prepare_markup
    for encoding in detector.encodings:
  File "/mnt/bcache/mnt/sda/d33tah/workspace/src/chromium/chromium/src/third_party/catapult/third_party/beautifulsoup4/bs4/dammit.py", line 256, in encodings
    self.chardet_encoding = chardet_dammit(self.markup)
  File "/mnt/bcache/mnt/sda/d33tah/workspace/src/chromium/chromium/src/third_party/catapult/third_party/beautifulsoup4/bs4/dammit.py", line 31, in chardet_dammit
    return chardet.detect(s)['encoding']
TypeError: 'NoneType' object has no attribute '__getitem__'
[5236/31265] CXX obj/third_party/flatbuffers/compiler_files/idl_parser.o
ninja: build stopped: subcommand failed.

Did this work before? N/A 

Chrome version: 57.0.2987.98  Channel: n/a
OS Version: Ubuntu 16.10
Flash Version: not relevant