Add "realpath" to CrOS build deps.

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 76 matching lines @@
   fi
 fi
 
 if [ "x$(id -u)" != x0 ] && [ 0 -eq "${do_quick_check-0}" ]; then
   echo "Running as non-root user."
   echo "You might have to enter your password one or more times for 'sudo'."
   echo
 fi
 
 # Packages needed for chromeos only
-chromeos_dev_list="libbluetooth-dev libxkbcommon-dev"
+chromeos_dev_list="libbluetooth-dev libxkbcommon-dev realpath"
 
 # Packages needed for development
 dev_list="apache2.2-bin bison cdbs curl dpkg-dev elfutils devscripts fakeroot
           flex fonts-thai-tlwg g++ git-core git-svn gperf language-pack-da
           language-pack-fr language-pack-he language-pack-zh-hant
           libapache2-mod-php5 libasound2-dev libbrlapi-dev libav-tools
           libbz2-dev libcairo2-dev libcap-dev libcups2-dev libcurl4-gnutls-dev
           libdrm-dev libelf-dev libexif-dev libgconf2-dev libglib2.0-dev
           libglu1-mesa-dev libgnome-keyring-dev libgtk2.0-dev libkrb5-dev
           libnspr4-dev libnss3-dev libpam0g-dev libpci-dev libpulse-dev
@@ skipping 344 matching lines @@
   # only contains libcrypto.so.1.0.0 and not the symlink needed for
   # linking (libcrypto.so).
   create_library_symlink /lib/i386-linux-gnu/libcrypto.so.1.0.0 \
       /usr/lib/i386-linux-gnu/libcrypto.so
 
   create_library_symlink /lib/i386-linux-gnu/libssl.so.1.0.0 \
       /usr/lib/i386-linux-gnu/libssl.so
 else
   echo "Skipping symbolic links for NaCl."
 fi