started here: https://build.chromium.org/p/chromium.fyi/builders/ClangToTiOS/builds/7908

very likely caused by https://codereview.chromium.org/2194703002

bot used gyp before, now dies with


Build type mismatch: was gyp, will be gn, clobbering //out/Release-iphoneos
Traceback (most recent call last):
  File "/b/build/slave/ClangToTiOS/build/src/tools/mb/mb.py", line 59, in Main
    ret = self.args.func()
  File "/b/build/slave/ClangToTiOS/build/src/tools/mb/mb.py", line 256, in CmdGen
    return self.RunGNGen(vals)
  File "/b/build/slave/ClangToTiOS/build/src/tools/mb/mb.py", line 761, in RunGNGen
    gn_args = self.GNArgs(vals)
  File "/b/build/slave/ClangToTiOS/build/src/tools/mb/mb.py", line 952, in GNArgs
    gn_args = gn_helpers.ToGNString(gn_helpers.FromGNArgs(gn_args))
  File "/b/build/slave/ClangToTiOS/build/src/build/gn_helpers.py", line 124, in FromGNArgs
    return parser.ParseArgs()
  File "/b/build/slave/ClangToTiOS/build/src/build/gn_helpers.py", line 213, in ParseArgs
    val = self._ParseAllowTrailing()
  File "/b/build/slave/ClangToTiOS/build/src/build/gn_helpers.py", line 237, in _ParseAllowTrailing
    raise GNException("Unexpected token: " + self.input[self.cur:])
GNException: Unexpected token: static_library ios_enable_code_signing=false target_cpu="arm" target_os="ios" goma_dir="/b/build/slave/cache/cipd/goma"
step returned non-zero exit code: 1
@@@STEP_FAILURE@@@