message: Enable -Wno-language-extension-token except on Windows
  It is required on Windows to be able to use __uuidof().
diff: @@ -112,10 +112,14 @@ config("dawn_internal") {
  cflags += [ "-pedantic" ]
  }
  + # On Windows allow the use of __uuidof()
  + if (is_win) {
  + cflags += [ "-Wno-language-extension-token" ]
  + }
  +
  # Flags for -pedantic warnings that haven't been fixed yet.
  cflags += [
  "-Wno-gnu-zero-variadic-macro-arguments",
  - "-Wno-language-extension-token",
  "-Wno-microsoft-enum-value",
  ]
  }
  