Do not use MB for Clang Upload bots.

scripts/slave/recipe_modules/chromium/config.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 pipes
 
 from recipe_engine.config import config_item_context, ConfigGroup
 from recipe_engine.config import Dict, List, Single, Static, Set, BadConf
 from recipe_engine.config_types import Path
 
@@ skipping 54 matching lines @@
       GYP_INCLUDE_LAST = Single(Path, required=False),
       GYP_LINK_CONCURRENCY = Single(int, required=False),
       GYP_MSVS_VERSION = Single(basestring, required=False),
       GYP_USE_SEPARATE_MSPDBSRV = Single(int, jsonish_fn=str, required=False),
       LLVM_DOWNLOAD_GOLD_PLUGIN = Single(int, required=False),
     ),
     env = ConfigGroup(
       PATH = List(Path),
       ADB_VENDOR_KEYS = Single(Path, required=False),
       LLVM_FORCE_HEAD_REVISION = Single(basestring, required=False),
+      LLVM_FORCE_LOCAL_BUILD = Single(basestring, required=False),
       GOMA_STUBBY_PROXY_IP_ADDRESS = Single(basestring, required=False),
     ),
     project_generator = ConfigGroup(
       tool = Single(basestring, empty_val='gyp'),
       args = Set(basestring),
     ),
     build_dir = Single(Path),
     cros_sdk = ConfigGroup(
       external = Single(bool, empty_val=True, required=False),
       args = List(basestring),
@@ skipping 453 matching lines @@
 @config_ctx()
 def clang_tot(c):
   c.env.LLVM_FORCE_HEAD_REVISION = 'YES'
   # Plugin flags often need to be changed when using a plugin newer than
   # the latest Clang package, so disable plugins.
   # TODO(pcc): Investigate whether this should be consistent between Windows and
   # non-Windows.
   if c.TARGET_PLATFORM != 'win':
     c.gyp_env.GYP_DEFINES['clang_use_chrome_plugins'] = 0
 
+@config_ctx()
+def clang_upload(c):
+  c.env.LLVM_FORCE_LOCAL_BUILD = 'YES'
+
 @config_ctx(includes=['ninja', 'clang', 'asan', 'static_library'])
 def win_asan(c):
   # These are set on the lkgr bot, and the fyi bots should match the lkgr bot.
   # TODO(thakis): Once the lkgr bot uses recipes, the lkgr and the fyi bots
   # should use the same context to ensure they use the same gyp defines.
   c.gyp_env.GYP_DEFINES['enable_ipc_fuzzer'] = 1
   c.gyp_env.GYP_DEFINES['v8_enable_verify_heap'] = 1
 
 #### 'Full' configurations
 @config_ctx(includes=['ninja', 'default_compiler'])
@@ skipping 253 matching lines @@
 def cast_linux(c):
   c.gyp_env.GYP_DEFINES['chromecast'] = 1
 
 @config_ctx()
 def internal_gles2_conform_tests(c):
   c.gyp_env.GYP_DEFINES['internal_gles2_conform_tests'] = 1
 
 @config_ctx()
 def build_angle_deqp_tests(c):
   c.gyp_env.GYP_DEFINES['build_angle_deqp_tests'] = 1