Remove support for Ubuntu/Precise sysroot

build/experimental/install-build-deps.py

 #!/usr/bin/env python
 # Copyright 2015 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.
 
 import argparse
 import operator
 import os
 import platform
 import re
 import subprocess
 import sys
 
 
 SUPPORTED_UBUNTU_VERSIONS = (
-  {'number': '12.04', 'codename': 'precise'},
   {'number': '14.04', 'codename': 'trusty'},
   {'number': '14.10', 'codename': 'utopic'},
   {'number': '15.04', 'codename': 'vivid'},
   {'number': '15.10', 'codename': 'wily'},
 )
 
 
 # Packages needed for chromeos only.
 _packages_chromeos_dev = (
   'libbluetooth-dev',
@@ skipping 266 matching lines @@
     # but g++-X.Y-multilib gives us the 32-bit support that we need. Find out
     # the appropriate value of X and Y by seeing what version the current
     # distribution's g++-multilib package depends on.
     output = subprocess.check_output(['apt-cache', 'depends', 'g++-multilib'])
     multilib_package = re.search(r'g\+\+-[0-9.]+-multilib', output).group()
     _packages_lib32 += (multilib_package,)
 
   lsb_codename = lsb_release_short_codename()
 
   # Find the proper version of libstdc++6-4.x-dbg.
-  if lsb_codename == 'precise':
-    _packages_dbg += ('libstdc++6-4.6-dbg',)
-  elif lsb_codename == 'trusty':
+  if lsb_codename == 'trusty':
     _packages_dbg += ('libstdc++6-4.8-dbg',)
   else:
     _packages_dbg += ('libstdc++6-4.9-dbg',)
 
   # Work around for dependency issue Ubuntu/Trusty: http://crbug.com/435056 .
   if lsb_codename == 'trusty':
     _packages_arm += (
       'g++-4.8-multilib-arm-linux-gnueabihf',
       'gcc-4.8-multilib-arm-linux-gnueabihf',
     )
@@ skipping 112 matching lines @@
   packages = sorted(set(packages), key=packages_key)
 
   if args.quick_check:
     return quick_check(packages)
 
   return 0
 
 
 if __name__ == '__main__':
   sys.exit(main(sys.argv[1:]))