Remove support for Ubuntu/Precise sysroot

BUG=564904

Review-Url: https://codereview.chromium.org/2596653002
Cr-Commit-Position: refs/heads/master@{#462884}

build/experimental/install-build-deps.py

@@ -13,7 +13,6 @@
 
 
 SUPPORTED_UBUNTU_VERSIONS = (
-  {'number': '12.04', 'codename': 'precise'},
   {'number': '14.04', 'codename': 'trusty'},
   {'number': '14.10', 'codename': 'utopic'},
   {'number': '15.04', 'codename': 'vivid'},
@@ -300,9 +299,7 @@ def compute_dynamic_package_lists():
   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',)

build/install-build-deps-android.sh

@@ -32,11 +32,7 @@ sudo apt-get -y install lib32z1 lighttpd python-pexpect xvfb x11-utils
 
 # Some binaries in the Android SDK require 32-bit libraries on the host.
 # See https://developer.android.com/sdk/installing/index.html?pkg=tools
-if [[ $lsb_release == "precise" ]]; then
-  sudo apt-get -y install ia32-libs
-else
-  sudo apt-get -y install libncurses5:i386 libstdc++6:i386 zlib1g:i386
-fi
+sudo apt-get -y install libncurses5:i386 libstdc++6:i386 zlib1g:i386
 
 # Required by //components/cronet/tools/generate_javadoc.py
 # TODO(375324): Stop requiring ANT.

build/linux/sysroot_scripts/install-sysroot.py

@@ -122,12 +122,6 @@ def InstallDefaultSysroots(host_arch):
   if host_arch == 'amd64':
     InstallDefaultSysrootForArch('i386')
 
-  # Desktop Chromium OS builds require the precise sysroot.
-  # TODO(thomasanderson): only download this when the GN arg target_os
-  # == 'chromeos', when the functionality to perform the check becomes
-  # available.
-  InstallSysroot('Precise', 'amd64')
-
   # If we can detect a non-standard target_arch such as ARM or MIPS,
   # then install the sysroot too.  Don't attempt to install arm64
   # since this is currently and android-only architecture.