Is it really Chromad-specific?

I think it was introduced by Thiemo, so kinda?

- Move cryptohome file to system_api and have cryptohome point at that.
- Mirror over to Chrome as usual.
- Remove Chrome's version and have Chrome point at that.

The following revision refers to this bug:
  https://chromium.googlesource.com/chromiumos/platform2/+/241ef9e0c1adf302ace3e5cbeba9dc4d95a35e8e

commit 241ef9e0c1adf302ace3e5cbeba9dc4d95a35e8e
Author: Lutz Justen <ljusten@chromium.org>
Date: Fri Jan 11 15:00:03 2019

Move install_attributes.proto to system_api

Moves install_attributes.proto from cryptohome to system_api, so that
it can be shared with Chrome. Right now, Chrome maintains its own copy.

BUG=chromium:775087
TEST=tryjobs

Change-Id: Iea013da2d23eda84aa2a70d3033ca04cccbc4a52
Reviewed-on: https://chromium-review.googlesource.com/1402785
Commit-Ready: Lutz Justen <ljusten@chromium.org>
Tested-by: Lutz Justen <ljusten@chromium.org>
Reviewed-by: Ryo Hashimoto <hashimoto@chromium.org>
Reviewed-by: Mike Frysinger <vapier@chromium.org>

[modify] https://crrev.com/241ef9e0c1adf302ace3e5cbeba9dc4d95a35e8e/cryptohome/libs/BUILD.gn
[rename] https://crrev.com/241ef9e0c1adf302ace3e5cbeba9dc4d95a35e8e/system_api/dbus/cryptohome/install_attributes.proto

The following revision refers to this bug:
  https://chromium.googlesource.com/chromiumos/platform2/+/042d306d61a82a9075260268a1eaeecf19953a3e

commit 042d306d61a82a9075260268a1eaeecf19953a3e
Author: Lutz Justen <ljusten@chromium.org>
Date: Tue Jan 15 10:54:55 2019

system_api: Add LITE_RUNTIME to install_attributes.proto

Cannot reuse the proto for Chrome since Chrome enforces the lite
runtime. Forgot to add this to CL:1402785.

BUG=chromium:775087
TEST=build_packages, tryjobs

Change-Id: I5b08cf07e947eca0678e72b1206be42449349fae
Reviewed-on: https://chromium-review.googlesource.com/1409943
Commit-Ready: Lutz Justen <ljusten@chromium.org>
Tested-by: Lutz Justen <ljusten@chromium.org>
Reviewed-by: Mike Frysinger <vapier@chromium.org>

[modify] https://crrev.com/042d306d61a82a9075260268a1eaeecf19953a3e/system_api/dbus/cryptohome/install_attributes.proto

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/2e91fec08b1b687045196f844aff5202360d8e42

commit 2e91fec08b1b687045196f844aff5202360d8e42
Author: Lutz Justen <ljusten@chromium.org>
Date: Wed Jan 16 14:21:08 2019

Roll src/third_party/cros_system_api/ ea44d5db9..5e6881be3 (8 commits)

https://chromium.googlesource.com/chromiumos/platform2/system_api.git/+log/ea44d5db9e74..5e6881be3c6b

$ git log ea44d5db9..5e6881be3 --date=short --no-merges --format='%ad %ae %s'
2019-01-14 ljusten system_api: Add LITE_RUNTIME to install_attributes.proto
2019-01-09 aoldemeier login: Also set block_devmode=0 in system properties when clearing FRE VPD.
2019-01-09 ljusten Move install_attributes.proto to system_api
2019-01-07 zachr system_api: add enable_gpu option to StartVmRequest
2018-12-12 iby vm_tools: Add unit test for ContainerListenerImpl
2018-11-16 edmanp arc: Add initial arc-keymasterd
2019-01-03 ejcaruso system_api: add UnmountRequest proto for cryptohome
2018-11-16 chirantan system_api: Add StartPluginVm method

Created with:
  roll-dep src/third_party/cros_system_api

Bug:775087

Change-Id: I09140cc9fd841b0d89f2e35bc100507bb0070bdb
Reviewed-on: https://chromium-review.googlesource.com/c/1412002
Reviewed-by: Roman Sorokin [CET] <rsorokin@chromium.org>
Commit-Queue: Lutz Justen <ljusten@chromium.org>
Cr-Commit-Position: refs/heads/master@{#623225}
[modify] https://crrev.com/2e91fec08b1b687045196f844aff5202360d8e42/DEPS

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/b0afc521fa85f664f3de0d2c13a99990c4944097

commit b0afc521fa85f664f3de0d2c13a99990c4944097
Author: Lutz Justen <ljusten@chromium.org>
Date: Fri Jan 18 10:09:53 2019

Use install_attributes.proto from system_api

Gets rid of Chrome's own copy of install_attributes.proto and uses the
one from system_api instead, which was recently moved there by
CL:1402785.

BUG=chromium:775087
TEST=Tryjobs

Change-Id: I5e9166eaee380d9f0e47c3312f4f19cb4ef62d72
Reviewed-on: https://chromium-review.googlesource.com/c/1402876
Commit-Queue: Lutz Justen <ljusten@chromium.org>
Reviewed-by: Sergey Poromov <poromov@chromium.org>
Reviewed-by: Steven Bennetts <stevenjb@chromium.org>
Reviewed-by: Roman Sorokin [CET] <rsorokin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#624055}
[modify] https://crrev.com/b0afc521fa85f664f3de0d2c13a99990c4944097/chromeos/dbus/BUILD.gn
[modify] https://crrev.com/b0afc521fa85f664f3de0d2c13a99990c4944097/chromeos/dbus/fake_cryptohome_client.cc
[modify] https://crrev.com/b0afc521fa85f664f3de0d2c13a99990c4944097/chromeos/tpm/install_attributes.cc
[modify] https://crrev.com/b0afc521fa85f664f3de0d2c13a99990c4944097/chromeos/tpm/install_attributes_unittest.cc
[modify] https://crrev.com/b0afc521fa85f664f3de0d2c13a99990c4944097/components/policy/proto/BUILD.gn
[delete] https://crrev.com/aacb4fc1f524ade63567c41f4cf4515df22971c8/components/policy/proto/install_attributes.proto