Give the clang upload bots shorter names.

masters/master.tryserver.chromium.win/slaves.cfg

 # -*- python -*-
 # ex: set syntax=python:
 # 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.
 
 def distribute_slaves(slave_numbers, builders, os_ver, pool=None, gce=False):
   hostname_format = 'vm%d-m4' if not gce else 'slave%d-c4'
   return [
     {
@@ skipping 27 matching lines @@
   ]
   cq_pool = distribute_slaves(cq_slaves, cq_builders, 'win7', 'win_cq')
 
   # Optional CQ builders. Split in two groups because of disk size.
   # Builders using the same checkout directory are grouped together
   # Number of builds per pool is supposed to be roughly balanced.
   optional_slaves_gn = [166, 171, 176, 177]
   optional_builders_gn = [
       # directory: win_archive
       'win_archive',
-      # directory: build_and_upload_clang
-      'win_chromium_clang_upload',
+      # directory: win_upload_clang
+      'win_upload_clang',  # Needs to be shorter than 17 chars, crbug.com/600465
       # directory: win_gn
       'win_chromium_gn_x64_dbg',
       'win_chromium_gn_x64_rel',
   ]
 
   optional_pool_gn = distribute_slaves(
       optional_slaves_gn, optional_builders_gn, 'win7', 'win_optional_gn')
 
   optional_slaves_chromium = [181, 185, 186, 187, 192]
   optional_builders_chromium = [
@@ skipping 68 matching lines @@
 
   return (
       cq_pool +
       optional_pool +
       win8_pool +
       win_pgo_pool +
       clang_win_pool)
 
 
 slaves = windows()