[ycm] The YouCompleteMe configuration is not VIM specific.

.ycm_extra_conf.py

 # Copyright 2015 the V8 project authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 # Autocompletion config for YouCompleteMe in V8.
 #
 # USAGE:
 #
 #   1. Install YCM [https://github.com/Valloric/YouCompleteMe]
 #          (Googlers should check out [go/ycm])
 #
-#   2. Point to this config file in your .vimrc:
-#          let g:ycm_global_ycm_extra_conf =
-#              '<v8_root>/tools/vim/v8.ycm_extra_conf.py'
-#
-#   3. Profit
+#   2. Profit
 #
 #
 # Usage notes:
 #
 #   * You must use ninja & clang to build V8.
 #
 #   * You must have run gyp_v8 and built V8 recently.
 #
 #
 # Hacking notes:
@@ skipping 95 matching lines @@
             break;
         else:
           # If this is a standalone -inl.h file with no source, the best we can
           # do is try to use the default flags.
           return v8_flags
       else:
         # If this is a standalone .h file with no source, the best we can do is
         # try to use the default flags.
         return v8_flags
 
-  sys.path.append(os.path.join(v8_root, 'tools', 'vim'))
+  sys.path.append(os.path.join(v8_root, 'tools', 'ninja'))
   from ninja_output import GetNinjaOutputDirectory
   out_dir = os.path.realpath(GetNinjaOutputDirectory(v8_root))
 
   # Ninja needs the path to the source file relative to the output build
   # directory.
   rel_filename = os.path.relpath(os.path.realpath(filename), out_dir)
 
   # Ask ninja how it would build our source file.
   p = subprocess.Popen(['ninja', '-v', '-C', out_dir, '-t',
                         'commands', rel_filename + '^'],
@@ skipping 45 matching lines @@
       'flags': (List of Strings) Command line flags.
       'do_cache': (Boolean) True if the result should be cached.
   """
   v8_root = FindV8SrcFromFilename(filename)
   v8_flags = GetClangCommandFromNinjaForFilename(v8_root, filename)
   final_flags = flags + v8_flags
   return {
     'flags': final_flags,
     'do_cache': True
   }