Suppress stderr on mesa package detection in install_build_deps.sh

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 142 matching lines @@
            libssl0.9.8:i386 libtinfo-dev libtinfo-dev:i386 libtool
            libxcomposite1:i386 libxcursor1:i386 libxdamage1:i386 libxi6:i386
            libxrandr2:i386 libxss1:i386 libxtst6:i386 texinfo xvfb
            ${naclports_list}"
 
 # Find the proper version of libgbm-dev. We can't just install libgbm-dev as
 # it depends on mesa, and only one version of mesa can exists on the system.
 # Hence we must match the same version or this entire script will fail.
 mesa_variant=""
 for variant in "-lts-quantal" "-lts-raring" "-lts-saucy" "-lts-trusty"; do
-  if $(dpkg-query -Wf'${Status}' libgl1-mesa-glx${variant} | \
+  if $(dpkg-query -Wf'${Status}' libgl1-mesa-glx${variant} 2>/dev/null | \
        grep -q " ok installed"); then
     mesa_variant="${variant}"
   fi
 done
 dev_list="${dev_list} libgbm-dev${mesa_variant}
           libgles2-mesa-dev${mesa_variant}"
 nacl_list="${nacl_list} libgl1-mesa-glx${mesa_variant}:i386"
 
 # Some package names have changed over time
 if package_exists ttf-mscorefonts-installer; then
@@ skipping 227 matching lines @@
   echo "Installing symbolic links for NaCl."
   if [ ! -r /usr/lib/i386-linux-gnu/libcrypto.so ]; then
     sudo ln -fs libcrypto.so.0.9.8 /usr/lib/i386-linux-gnu/libcrypto.so
   fi
   if [ ! -r /usr/lib/i386-linux-gnu/libssl.so ]; then
     sudo ln -fs libssl.so.0.9.8 /usr/lib/i386-linux-gnu/libssl.so
   fi
 else
   echo "Skipping symbolic links for NaCl."
 fi