Clean up target_os=llvm now that it does nothing.

infra/bots/recipe_modules/core/api.py

 # Copyright 2014 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.
 
 
 # pylint: disable=W0201
 
 
 import json
 import os
@@ skipping 92 matching lines @@
     if self.m.vars.need_pdfium_checkout:
       pdfium = gclient_cfg.solutions.add()
       pdfium.name = 'pdfium'
       pdfium.managed = False
       pdfium.url = 'https://pdfium.googlesource.com/pdfium.git'
       pdfium.revision = 'origin/master'
       self.update_repo(self.m.vars.checkout_root, pdfium)
 
     # Run 'gclient sync'.
     gclient_cfg.got_revision_mapping['skia'] = 'got_revision'
-    gclient_cfg.target_os.add('llvm')
     checkout_kwargs = {}
     checkout_kwargs['env'] = self.m.vars.default_env
 
     # api.gclient.revert() assumes things about the layout of the code, so it
     # fails for us. Run an appropriate revert sequence for trybots instead.
     gclient_file = self.m.vars.checkout_root.join('.gclient')
     if (self.m.tryserver.is_tryserver and
         self.m.path.exists(gclient_file)):  # pragma: no cover
       # These steps taken from:
       # https://chromium.googlesource.com/chromium/tools/build/+/
@@ skipping 16 matching lines @@
     self.m.vars.got_revision = (
         update_step.presentation.properties['got_revision'])
     self.m.tryserver.maybe_apply_issue()
     if self.m.properties.get('patch_storage') == 'gerrit':
       self.m.bot_update.apply_gerrit_ref(
           root=str(self.m.vars.checkout_root.join('skia')))
 
     if self.m.vars.need_chromium_checkout:
       self.m.gclient.runhooks(cwd=self.m.vars.checkout_root,
                               env=self.m.vars.gclient_env)