Delete some code that is no longer needed

tools/clang/scripts/update.sh

 #!/usr/bin/env bash
 # Copyright (c) 2011 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 will check out llvm and clang into third_party/llvm and build it.
 
 THIS_DIR="$(dirname "${0}")"
 LLVM_DIR="${THIS_DIR}/../../../third_party/llvm"
 LLVM_BUILD_DIR="${LLVM_DIR}/../llvm-build"
@@ skipping 36 matching lines @@
       exit 1
       ;;
   esac
   shift
 done
 
 if [[ -n "$mac_only" ]] && [[ "${OS}" != "Darwin" ]]; then
   exit 0
 fi
 
-# TODO(thakis): Remove this after Sept 29 2011. http://crbug.com/96722
-for rev in 138188 138417 139029 139473 139990; do
-  rm -f clang-$rev.tgz
-  rm -rf clang-$rev
-done
-
 # Xcode and clang don't get along when predictive compilation is enabled.
 # http://crbug.com/96315
 if [[ "${OS}" = "Darwin" ]] && xcodebuild -version | grep -q 'Xcode 3.2' ; then
   XCONF=com.apple.Xcode
   if [[ "${GYP_GENERATORS}" != "make" ]] && \
      [ "$(defaults read "${XCONF}" EnablePredictiveCompilation)" != "0" ]; then
     echo
     echo "          HEARKEN!"
     echo "You're using Xcode3 and you have 'Predictive Compilation' enabled."
     echo "This does not work well with clang (http://crbug.com/96315)."
@@ skipping 144 matching lines @@
 if [[ -n "$run_tests" ]]; then
   # Run a few tests.
   "${PLUGIN_SRC_DIR}/tests/test.sh" "${LLVM_BUILD_DIR}/Release+Asserts"
   cd "${LLVM_BUILD_DIR}"
   make check-all
   cd -
 fi
 
 # After everything is done, log success for this revision.
 echo "${CLANG_REVISION}" > "${STAMP_FILE}"