Delete update_iwyu.sh

IWYU in its current form doesn't work well, and this script
fell victim to bitrot due to being unused.

BUG=143643

Review URL: https://chromiumcodereview.appspot.com/10828383

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@152320 0039d316-1c4b-4281-b951-d872f2087c98

tools/clang/scripts/update_iwyu.sh

-#!/bin/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 iwyu into the llvm directory and build it.
-# iwyu will appear in third_party/llvm-build/Release+Asserts/bin.
-
-# Die if any command dies.
-set -e
-
-# Echo all commands.
-set -x
-
-THIS_DIR="$(dirname "${0}")"
-
-# Make sure clang is checked out and built.
-"${THIS_DIR}"/update.sh
-
-LLVM_DIR="${THIS_DIR}"/../../../third_party/llvm
-IWYU_DIR="${LLVM_DIR}"/tools/clang/tools/include-what-you-use
-
-# Check out.
-svn co --force https://include-what-you-use.googlecode.com/svn/trunk/ \
-  "${IWYU_DIR}"
-
-# Build iwyu.
-# Copy it into the clang tree and use clang's build system to compile it.
-LLVM_BUILD_DIR="${LLVM_DIR}"/../llvm-build
-IWYU_BUILD_DIR="${LLVM_BUILD_DIR}"/tools/clang/tools/include-what-you-use
-mkdir -p "${IWYU_BUILD_DIR}"
-cp "${IWYU_DIR}"/Makefile "${IWYU_BUILD_DIR}"
-make -j"${NUM_JOBS}" -C "${IWYU_BUILD_DIR}"