Do not use MB for Clang Upload bots.

scripts/slave/recipe_modules/chromium/api.py

 # Copyright 2013 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 re
 
 from recipe_engine import recipe_api
 from recipe_engine import util as recipe_util
 
 class TestLauncherFilterFileInputPlaceholder(recipe_util.Placeholder):
@@ skipping 43 matching lines @@
 
   def get_env(self):
     ret = {}
     if self.c.env.PATH:
       ret['PATH'] = self.m.path.pathsep.join(
           map(str, self.c.env.PATH) + ['%(PATH)s'])
     if self.c.env.ADB_VENDOR_KEYS:
       ret['ADB_VENDOR_KEYS'] = self.c.env.ADB_VENDOR_KEYS
     if self.c.env.LLVM_FORCE_HEAD_REVISION:
       ret['LLVM_FORCE_HEAD_REVISION'] = self.c.env.LLVM_FORCE_HEAD_REVISION
+    if self.c.env.LLVM_FORCE_LOCAL_BUILD:
+      ret['LLVM_FORCE_LOCAL_BUILD'] = self.c.env.LLVM_FORCE_LOCAL_BUILD
     if self.c.env.GOMA_STUBBY_PROXY_IP_ADDRESS:
       ret['GOMA_STUBBY_PROXY_IP_ADDRESS'] = \
         self.c.env.GOMA_STUBBY_PROXY_IP_ADDRESS
     return ret
 
   @property
   def build_properties(self):
     return self._build_properties
 
   @property
@@ skipping 605 matching lines @@
       }))
 
   def get_annotate_by_test_name(self, test_name):
     return 'graphing'
 
   def download_lto_plugin(self):
     return self.m.python(
         name='download LTO plugin',
         script=self.m.path['checkout'].join(
             'build', 'download_gold_plugin.py'))