See issue 818747 for steps for turning syzyasan back on.

The zap_timestamps utility is still used on 32 bit builders. As soon as we've switched over to lld, this'll be redundant and can be removed without any consequence.

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/69d0bcdd9729d123d9ba030d9506f763f0e2e56f

commit 69d0bcdd9729d123d9ba030d9506f763f0e2e56f
Author: Sigurdur Asgeirsson <siggi@chromium.org>
Date: Thu Mar 29 21:50:51 2018

Remove Syzygy/SyzyASAN build configuration and related code.

This removes the is_syzyasan build flag and related build configuration.
Everything under the SYZYASAN define is either removed, or moved under
ADDRESS_SANITIZER, as e.g. the previously SyzyASAN-only heap corruption
debug URLs.

The DCHECK debug URL is now enabled and the activity tracker grabs a
stack trace when DCHECK_IS_ON(), instead of only under SYZYASAN.

The metrics system sets the is_asan_build bit in the system profile now
under ADDRESS_SANITIZER, against the day when we ship Clang ASAN builds.

The SyzyProf profiling support is removed.

To support the upcoming official build with configurable DCHECKs, the
channel string visible in chrome://settings/help is adorned with "DCheck".

The DEPS to fetch the Syzygy binary archive is left in place, as the
zap_timestamps.exe utility is still in use. Once LLD replaces the MSVC
linker, that can be removed without penalty, at which time the DEPS will
be scrubbed.

Bug:  821764 
Change-Id: I08202da8f032f2350a589cfcda9e9b2edd147b7d
Reviewed-on: https://chromium-review.googlesource.com/980912
Reviewed-by: Will Harris <wfh@chromium.org>
Reviewed-by: John Abd-El-Malek <jam@chromium.org>
Reviewed-by: Wez <wez@chromium.org>
Reviewed-by: Nico Weber <thakis@chromium.org>
Reviewed-by: Chris Hamilton <chrisha@chromium.org>
Reviewed-by: Sébastien Marchand <sebmarchand@chromium.org>
Commit-Queue: Sigurður Ásgeirsson <siggi@chromium.org>
Cr-Commit-Position: refs/heads/master@{#546966}
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[modify] https://crrev.com/69d0bcdd9729d123d9ba030d9506f763f0e2e56f/base/allocator/README.md
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[delete] https://crrev.com/297d5f530fb894970ea5a6f1d9ffc18d89e555e9/build/win/syzygy/BUILD.gn
[delete] https://crrev.com/297d5f530fb894970ea5a6f1d9ffc18d89e555e9/build/win/syzygy/OWNERS
[delete] https://crrev.com/297d5f530fb894970ea5a6f1d9ffc18d89e555e9/build/win/syzygy/instrument.py
[delete] https://crrev.com/297d5f530fb894970ea5a6f1d9ffc18d89e555e9/build/win/syzygy/reorder.py
[delete] https://crrev.com/297d5f530fb894970ea5a6f1d9ffc18d89e555e9/build/win/syzygy/syzyasan-allocation-filter.txt
[delete] https://crrev.com/297d5f530fb894970ea5a6f1d9ffc18d89e555e9/build/win/syzygy/syzyasan-instrumentation-filter.txt
[delete] https://crrev.com/297d5f530fb894970ea5a6f1d9ffc18d89e555e9/build/win/syzygy/syzygy.gni
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[modify] https://crrev.com/69d0bcdd9729d123d9ba030d9506f763f0e2e56f/chrome/browser/chrome_browser_main.cc
[modify] https://crrev.com/69d0bcdd9729d123d9ba030d9506f763f0e2e56f/chrome/browser/extensions/active_tab_apitest.cc
[modify] https://crrev.com/69d0bcdd9729d123d9ba030d9506f763f0e2e56f/chrome/browser/extensions/api/bookmark_manager_private/bookmark_manager_private_apitest.cc
[modify] https://crrev.com/69d0bcdd9729d123d9ba030d9506f763f0e2e56f/chrome/browser/extensions/api/context_menus/context_menu_apitest.cc
[modify] https://crrev.com/69d0bcdd9729d123d9ba030d9506f763f0e2e56f/chrome/browser/extensions/api/cookies/cookies_apitest.cc
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[modify] https://crrev.com/69d0bcdd9729d123d9ba030d9506f763f0e2e56f/chrome/browser/profiling_host/chrome_browser_main_extra_parts_profiling.cc
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The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/ed05d62660b3fd83ed7724fbe5609b529f9e31d1

commit ed05d62660b3fd83ed7724fbe5609b529f9e31d1
Author: Wez <wez@chromium.org>
Date: Wed Apr 11 20:06:25 2018

Fix string literal in GetChannelName() for official builds.

Bug:  812058 ,  821764 ,  831697 
Change-Id: I86759e3ed14cdda2e397f67a23481dd1cf5c7844
Reviewed-on: https://chromium-review.googlesource.com/1007882
Commit-Queue: Wez <wez@chromium.org>
Reviewed-by: Nico Weber <thakis@chromium.org>
Reviewed-by: Sigurður Ásgeirsson <siggi@chromium.org>
Cr-Commit-Position: refs/heads/master@{#549946}
[modify] https://crrev.com/ed05d62660b3fd83ed7724fbe5609b529f9e31d1/chrome/common/channel_info_win.cc

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/330c3615157cd58b987a27440fd2abaa1573d3a2

commit 330c3615157cd58b987a27440fd2abaa1573d3a2
Author: Wez <wez@chromium.org>
Date: Thu Apr 12 04:58:36 2018

Fix string literal in GetChannelName() for official builds.

Bug:  812058 ,  821764 ,  831697 
Change-Id: I86759e3ed14cdda2e397f67a23481dd1cf5c7844
Reviewed-on: https://chromium-review.googlesource.com/1007882
Commit-Queue: Wez <wez@chromium.org>
Reviewed-by: Nico Weber <thakis@chromium.org>
Reviewed-by: Sigurður Ásgeirsson <siggi@chromium.org>
Cr-Original-Commit-Position: refs/heads/master@{#549946}(cherry picked from commit ed05d62660b3fd83ed7724fbe5609b529f9e31d1)
Reviewed-on: https://chromium-review.googlesource.com/1009126
Reviewed-by: Wez <wez@chromium.org>
Cr-Commit-Position: refs/branch-heads/3395@{#2}
Cr-Branched-From: 19ac07e50344cdf4089e5d1b696958867736fc03-refs/heads/master@{#549859}
[modify] https://crrev.com/330c3615157cd58b987a27440fd2abaa1573d3a2/chrome/common/channel_info_win.cc

Fixed?

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/96d692b3f755e51519b4d7c37dc0ea2491b6ac68

commit 96d692b3f755e51519b4d7c37dc0ea2491b6ac68
Author: Sebastien Marchand <sebmarchand@chromium.org>
Date: Thu Aug 02 17:47:59 2018

Remove zap_timestamp and the Syzygy deps

This isn't needed anymore as we're now using LLD.

Bug:  804926 ,  821764 
Change-Id: I3c6e4ce0793997823b89978cf7eda5b3a26399b8
Reviewed-on: https://chromium-review.googlesource.com/1108185
Reviewed-by: Sigurður Ásgeirsson <siggi@chromium.org>
Reviewed-by: Nico Weber <thakis@chromium.org>
Commit-Queue: Sébastien Marchand <sebmarchand@chromium.org>
Cr-Commit-Position: refs/heads/master@{#580239}
[modify] https://crrev.com/96d692b3f755e51519b4d7c37dc0ea2491b6ac68/DEPS
[delete] https://crrev.com/1fffcaa3a17ce8a428343bd633f5f9583108dc79/build/get_syzygy_binaries.py
[modify] https://crrev.com/96d692b3f755e51519b4d7c37dc0ea2491b6ac68/tools/determinism/deterministic_build_blacklist.json
[modify] https://crrev.com/96d692b3f755e51519b4d7c37dc0ea2491b6ac68/tools/determinism/remove_build_metadata.py

Assuming Seb's CL sticks, I think that's the last of'er.