Fixing install-build-deps.sh to install the correct version of libstdc++ with debugging symbols.

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 119 matching lines @@
           libxau6 libxcb1 libxcomposite1 libxcursor1 libxdamage1 libxdmcp6
           libxext6 libxfixes3 libxi6 libxinerama1 libxrandr2 libxrender1
           libxtst6 zlib1g $chromeos_lib_list"
 
 # Debugging symbols for all of the run-time libraries
 dbg_list="libatk1.0-dbg libc6-dbg libcairo2-dbg libfontconfig1-dbg
           libglib2.0-0-dbg libgtk2.0-0-dbg libpango1.0-0-dbg libpcre3-dbg
           libpixman-1-0-dbg libsqlite3-0-dbg libx11-6-dbg libxau6-dbg
           libxcb1-dbg libxcomposite1-dbg libxcursor1-dbg libxdamage1-dbg
           libxdmcp6-dbg libxext6-dbg libxfixes3-dbg libxi6-dbg libxinerama1-dbg
-          libxrandr2-dbg libxrender1-dbg libxtst6-dbg zlib1g-dbg
-          libstdc++6-4.6-dbg"
+          libxrandr2-dbg libxrender1-dbg libxtst6-dbg zlib1g-dbg"
+
+# Find the proper version of libstdc++6-4.x-dbg.
+if [ "x$lsb_release" = "xprecise" ]; then
+  dbg_list="${dbg_list} libstdc++6-4.6-dbg"
+elif [ "x$lsb_release" = "xtrusty" ]; then
+  dbg_list="${dbg_list} libstdc++6-4.8-dbg"
+else
+  dbg_list="${dbg_list} libstdc++6-4.9-dbg"
+fi
 
 # 32-bit libraries needed e.g. to compile V8 snapshot for Android or armhf
 lib32_list="linux-libc-dev:i386"
 
 # arm cross toolchain packages needed to build chrome on armhf
 arm_list="libc6-dev-armhf-cross
           linux-libc-dev-armhf-cross
           g++-arm-linux-gnueabihf"
 
 # Packages to build NaCl, its toolchains, and its ports.
@@ skipping 286 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