Adds metacity to the install-build-deps.sh list so it gets installed on bots.

build/install-build-deps.sh

 #!/bin/bash -e
 
 # 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.
 
 # Script to install everything needed to build chromium (well, ideally, anyway)
 # See http://code.google.com/p/chromium/wiki/LinuxBuildInstructions
 # and http://code.google.com/p/chromium/wiki/LinuxBuild64Bit
 
@@ skipping 57 matching lines @@
 chromeos_dev_list="libbluetooth-dev libpulse-dev"
 
 # Packages need for development
 dev_list="apache2.2-bin bison curl elfutils fakeroot flex g++ gperf
           language-pack-fr libapache2-mod-php5 libasound2-dev libbz2-dev
           libcairo2-dev libcups2-dev libcurl4-gnutls-dev libelf-dev
           libgconf2-dev libgl1-mesa-dev libglib2.0-dev libglu1-mesa-dev
           libgnome-keyring-dev libgtk2.0-dev libkrb5-dev libnspr4-dev
           libnss3-dev libpam0g-dev libpci-dev libsctp-dev libspeechd-dev
           libsqlite3-dev libssl-dev libudev-dev libwww-perl libxslt1-dev
-          libxss-dev libxt-dev libxtst-dev mesa-common-dev patch perl php5-cgi
-          pkg-config python python-cherrypy3 python-dev python-psutil rpm ruby
-          subversion ttf-dejavu-core ttf-indic-fonts ttf-kochi-gothic
+          libxss-dev libxt-dev libxtst-dev mesa-common-dev metacity patch perl
+          php5-cgi pkg-config python python-cherrypy3 python-dev python-psutil
+          rpm ruby subversion ttf-dejavu-core ttf-indic-fonts ttf-kochi-gothic
           ttf-kochi-mincho ttf-thai-tlwg wdiff git-core
           $chromeos_dev_list"
 
 # 64-bit systems need a minimum set of 32-bit compat packages for the pre-built
 # NaCl binaries. These are always needed, regardless of whether or not we want
 # the full 32-bit "cross-compile" support (--lib32).
 if [ "$(uname -m)" = "x86_64" ]; then
   dev_list="${dev_list} libc6-i386 lib32gcc1 lib32stdc++6"
 fi
 
@@ skipping 359 matching lines @@
              sed -e 's/[.]so[.][0-9].*/.so/' |
              sort -u); do
     [ "x${i##*/}" = "xld-linux.so" ] && continue
     [ -r "$i" ] && continue
     j="$(ls "$i."* | sed -e 's/.*[.]so[.]\([^.]*\)$/\1/;t;d' |
          sort -n | tail -n 1)"
     [ -r "$i.$j" ] || continue
     sudo ln -s "${i##*/}.$j" "$i"
   done
 fi