[headless] Fix relative path in client_api_generator.

headless/lib/browser/devtools_api/client_api_generator.py

 # Copyright 2016 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 import argparse
 import collections
 import os.path
 import re
 import sys
 try:
   import json
 except ImportError:
   import simplejson as json
 
 # Path handling for libraries and templates
 # Paths have to be normalized because Jinja uses the exact template path to
 # determine the hash used in the cache filename, and we need a pre-caching step
 # to be concurrency-safe. Use absolute path because __file__ is absolute if
 # module is imported, and relative if executed directly.
 # If paths differ between pre-caching and individual file compilation, the cache
 # is regenerated, which causes a race condition and breaks concurrent build,
 # since some compile processes will try to read the partially written cache.
 module_path, module_filename = os.path.split(os.path.realpath(__file__))
-third_party_dir = os.path.normpath(os.path.join(
-    module_path, os.pardir, os.pardir, os.pardir, 'third_party'))
+third_party_dir = os.path.normpath(
+    os.path.join(module_path, os.pardir, os.pardir, os.pardir, os.pardir,
+                 'third_party'))
 templates_dir = module_path
 
 # jinja2 is in chromium's third_party directory.
 # Insert at 1 so at front to override system libraries, and
 # after path[0] == invoking script dir
 sys.path.insert(1, third_party_dir)
 import jinja2
 
 
 def ParseArguments(args):
@@ skipping 490 matching lines @@
   InitializeDomainDependencies(json_api)
   PatchExperimentalCommandsAndEvents(json_api)
   EnsureCommandsHaveParametersAndReturnTypes(json_api)
   SynthesizeCommandTypes(json_api)
   SynthesizeEventTypes(json_api)
   PatchFullQualifiedRefs(json_api)
   CreateTypeDefinitions(json_api)
   GenerateDomains(jinja_env, output_dirname, json_api)
   GenerateTypes(jinja_env, output_dirname, json_api)
   GenerateTypeConversions(jinja_env, output_dirname, json_api)