Well, the Wheezy sysroot is what we build against when we run on Precise (i.e., we don't have a Precise sysroot).

While we don't support Chrome on Precise in the wild, we still build on it and are just now (literally, this week) trying to shut down the remaining Precise builders, so I think we can almost get rid of this now.

sbc already has a cl open for this waiting to go, so assigning to him
https://codereview.chromium.org/2597523003

Last time I tried to switch to jessie I ran into issues with some bots still being on precise:
https://codereview.chromium.org/2361223002/

Will try gain now.

There were many, many bots still on precise back then. We have been trying to stamp them out and I think we're down to a half-dozen or so at this point. It's possible that we don't have any that we actually need to build Chrome now. 

We have a few like Goma and some Infra bots that build on Precise specifically to build on Precise, that we may be able to shut down. There's a bunch of CrOS bots left but I don't think they're affected by this (they have their own sysroots/chroots).

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/325bd8b938ccfecfaa698ebb482c5b1cb0337022

commit 325bd8b938ccfecfaa698ebb482c5b1cb0337022
Author: sbc <sbc@chromium.org>
Date: Wed Apr 05 19:36:16 2017

Remove wheezy sysroot images support

We have switched to a debian/jessie sysroot so
wheezy support is not longer needed.

BUG= 697494 

Review-Url: https://codereview.chromium.org/2597523003
Cr-Commit-Position: refs/heads/master@{#462181}

[delete] https://crrev.com/27c6839fb87a7ee23fdf6f0fc8543487f155cbc1/build/linux/sysroot_scripts/debian-archive-wheezy-stable.gpg
[delete] https://crrev.com/27c6839fb87a7ee23fdf6f0fc8543487f155cbc1/build/linux/sysroot_scripts/packagelist.wheezy.amd64
[delete] https://crrev.com/27c6839fb87a7ee23fdf6f0fc8543487f155cbc1/build/linux/sysroot_scripts/packagelist.wheezy.arm
[delete] https://crrev.com/27c6839fb87a7ee23fdf6f0fc8543487f155cbc1/build/linux/sysroot_scripts/packagelist.wheezy.i386
[delete] https://crrev.com/27c6839fb87a7ee23fdf6f0fc8543487f155cbc1/build/linux/sysroot_scripts/packagelist.wheezy.mipsel
[delete] https://crrev.com/27c6839fb87a7ee23fdf6f0fc8543487f155cbc1/build/linux/sysroot_scripts/sysroot-creator-wheezy.sh
[modify] https://crrev.com/325bd8b938ccfecfaa698ebb482c5b1cb0337022/build/linux/sysroot_scripts/sysroots.json
[modify] https://crrev.com/325bd8b938ccfecfaa698ebb482c5b1cb0337022/chrome/installer/linux/BUILD.gn
[modify] https://crrev.com/325bd8b938ccfecfaa698ebb482c5b1cb0337022/chrome/installer/linux/debian/build.sh
[delete] https://crrev.com/27c6839fb87a7ee23fdf6f0fc8543487f155cbc1/chrome/installer/linux/debian/expected_deps_ia32_wheezy
[delete] https://crrev.com/27c6839fb87a7ee23fdf6f0fc8543487f155cbc1/chrome/installer/linux/debian/expected_deps_x64_wheezy
[delete] https://crrev.com/27c6839fb87a7ee23fdf6f0fc8543487f155cbc1/chrome/installer/linux/sysroot_scripts/packagelist.wheezy.mipsel
[modify] https://crrev.com/325bd8b938ccfecfaa698ebb482c5b1cb0337022/docs/linux_chromium_arm.md
[modify] https://crrev.com/325bd8b938ccfecfaa698ebb482c5b1cb0337022/testing/buildbot/trybot_analyze_config.json

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/75cc3b096e245801afa0607dc4f8adc03566ae16

commit 75cc3b096e245801afa0607dc4f8adc03566ae16
Author: sbc <sbc@chromium.org>
Date: Mon Apr 10 19:44:17 2017

Refactor target_sysroot_dir gn argument

This change was motivated by the need to remove the
references to wheezy.  I noticed that the target_sysroot_dir
argument could be generalized which avoids the extra
conditional in sysroot.gni.

BUG= 697494 

Review-Url: https://codereview.chromium.org/2810633004
Cr-Commit-Position: refs/heads/master@{#463368}

[modify] https://crrev.com/75cc3b096e245801afa0607dc4f8adc03566ae16/build/config/sysroot.gni

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/3b9661305b564c476e9259c25f5a16ab45d5f734

commit 3b9661305b564c476e9259c25f5a16ab45d5f734
Author: sbc <sbc@chromium.org>
Date: Wed May 10 17:45:03 2017

Remove references to debian wheezy sysroot

BUG= 697494 

Review-Url: https://codereview.chromium.org/2847533005
Cr-Commit-Position: refs/heads/master@{#470634}

[modify] https://crrev.com/3b9661305b564c476e9259c25f5a16ab45d5f734/docs/clang_tidy.md
[modify] https://crrev.com/3b9661305b564c476e9259c25f5a16ab45d5f734/infra/scripts/legacy/scripts/slave/chromium/sizes.py
[modify] https://crrev.com/3b9661305b564c476e9259c25f5a16ab45d5f734/tools/checklicenses/checklicenses.py
[modify] https://crrev.com/3b9661305b564c476e9259c25f5a16ab45d5f734/tools/copyright_scanner/copyright_scanner.py