Remove support for downloading gold plugin.

tools/clang/scripts/update.py

 #!/usr/bin/env python
 # Copyright (c) 2012 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.
 
 """This script is used to download prebuilt clang binaries.
 
 It is also used by package.py to build the prebuilt clang binaries."""
 
 import argparse
@@ skipping 378 matching lines @@
   version_out = re.match(r'clang version ([0-9.]+)', version_out).group(1)
   if version_out != VERSION:
     print ('unexpected clang version %s (not %s), update VERSION in update.py'
            % (version_out, VERSION))
     sys.exit(1)
 
 
 def UpdateClang(args):
   print 'Updating Clang to %s...' % PACKAGE_VERSION
 
-  need_gold_plugin = 'LLVM_DOWNLOAD_GOLD_PLUGIN' in os.environ or (
-      sys.platform.startswith('linux') and
-      'buildtype=Official' in os.environ.get('GYP_DEFINES', ''))
-
   if ReadStampFile() == PACKAGE_VERSION and not args.force_local_build:
     print 'Clang is already up to date.'
-    if not need_gold_plugin or os.path.exists(
-        os.path.join(LLVM_BUILD_DIR, "lib/LLVMgold.so")):
-      return 0
+    return 0
 
   # Reset the stamp file in case the build is unsuccessful.
   WriteStampFile('')
 
   if not args.force_local_build:
     cds_file = "clang-%s.tgz" %  PACKAGE_VERSION
     if sys.platform == 'win32' or sys.platform == 'cygwin':
       cds_full_url = CDS_URL + '/Win/' + cds_file
     elif sys.platform == 'darwin':
       cds_full_url = CDS_URL + '/Mac/' + cds_file
     else:
       assert sys.platform.startswith('linux')
       cds_full_url = CDS_URL + '/Linux_x64/' + cds_file
 
     print 'Downloading prebuilt clang'
     if os.path.exists(LLVM_BUILD_DIR):
       RmTree(LLVM_BUILD_DIR)
     try:
       DownloadAndUnpack(cds_full_url, LLVM_BUILD_DIR)
       print 'clang %s unpacked' % PACKAGE_VERSION
       if sys.platform == 'win32':
         CopyDiaDllTo(os.path.join(LLVM_BUILD_DIR, 'bin'))
-      # Download the gold plugin if requested to by an environment variable.
-      # This is used by the CFI ClusterFuzz bot, and it's required for official
-      # builds on linux.
-      if need_gold_plugin:
-        RunCommand(['python', CHROMIUM_DIR+'/build/download_gold_plugin.py'])
       WriteStampFile(PACKAGE_VERSION)
       return 0
     except urllib2.URLError:
       print 'Failed to download prebuilt clang %s' % cds_file
       print 'Use --force-local-build if you want to build locally.'
       print 'Exiting.'
       return 1
 
   if args.with_android and not os.path.exists(ANDROID_NDK_DIR):
     print 'Android NDK not found at ' + ANDROID_NDK_DIR
@@ skipping 470 matching lines @@
     args.force_local_build = True
     if 'OS=android' not in os.environ.get('GYP_DEFINES', ''):
       # Only build the Android ASan rt on ToT bots when targetting Android.
       args.with_android = False
 
   return UpdateClang(args)
 
 
 if __name__ == '__main__':
   sys.exit(main())