The current plan is to revert https://codereview.chromium.org/2671433002/
and cherrypick the revert to M58 and M59 branches.

Issue 370104 will be reopened and a new fix can be made.

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/9f89092a8f533da1537b0a441b1e137b3d3b2728

commit 9f89092a8f533da1537b0a441b1e137b3d3b2728
Author: pkl <pkl@chromium.org>
Date: Wed May 03 19:08:18 2017

Revert of Don't set cpu architecture field on iOS in UMA logs. (patchset #2 id:20001 of https://codereview.chromium.org/2671433002/ )

Reason for revert:
This breaks Chrome iOS dashboards because cpu_architecture is the only field where we have the device model info (e.g. iPhone7,2).

Original issue's description:
> Don't set cpu architecture field on iOS in UMA logs.
>
> The value we were setting it to before was not correct, so this
> change instead just makes the value not get set on iOS.
>
> BUG=370104
>
> Review-Url: https://codereview.chromium.org/2671433002
> Cr-Commit-Position: refs/heads/master@{#447578}
> Committed: https://chromium.googlesource.com/chromium/src/+/a86e8e115054ad167458d0379980db5473cb20de

TBR=rkaplow@chromium.org,asvitkine@chromium.org
# Not skipping CQ checks because original CL landed more than 1 days ago.
BUG=370104,  718080 

Review-Url: https://codereview.chromium.org/2855943005
Cr-Commit-Position: refs/heads/master@{#469062}

[modify] https://crrev.com/9f89092a8f533da1537b0a441b1e137b3d3b2728/components/metrics/metrics_log.cc
[modify] https://crrev.com/9f89092a8f533da1537b0a441b1e137b3d3b2728/components/metrics/metrics_log_unittest.cc

[Auto-generated comment by a script] We noticed that this issue is targeted for M-58; it appears the fix may have landed after branch point, meaning a merge might be required. Please confirm if a merge is required here - if so add Merge-Request-58 label, otherwise remove Merge-TBD label. Thanks.

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/b293236194e22d784a5d77a04ebfad88e33f824e

commit b293236194e22d784a5d77a04ebfad88e33f824e
Author: asvitkine <asvitkine@chromium.org>
Date: Fri May 05 14:02:47 2017

Reland of Don't set cpu architecture field on iOS in UMA logs. (patchset #1 id:1 of https://codereview.chromium.org/2855943005/ )

Reason for revert:
Can be relanded now that we're filling in hardware class on iOS.

Original issue's description:
> Revert of Don't set cpu architecture field on iOS in UMA logs. (patchset #2 id:20001 of https://codereview.chromium.org/2671433002/ )
>
> Reason for revert:
> This breaks Chrome iOS dashboards because cpu_architecture is the only field where we have the device model info (e.g. iPhone7,2).
>
> Original issue's description:
> > Don't set cpu architecture field on iOS in UMA logs.
> >
> > The value we were setting it to before was not correct, so this
> > change instead just makes the value not get set on iOS.
> >
> > BUG=370104
> >
> > Review-Url: https://codereview.chromium.org/2671433002
> > Cr-Commit-Position: refs/heads/master@{#447578}
> > Committed: https://chromium.googlesource.com/chromium/src/+/a86e8e115054ad167458d0379980db5473cb20de
>
> TBR=rkaplow@chromium.org,asvitkine@chromium.org
> # Not skipping CQ checks because original CL landed more than 1 days ago.
> BUG=370104,  718080 
>
> Review-Url: https://codereview.chromium.org/2855943005
> Cr-Commit-Position: refs/heads/master@{#469062}
> Committed: https://chromium.googlesource.com/chromium/src/+/9f89092a8f533da1537b0a441b1e137b3d3b2728

TBR=pkl@chromium.org
# Not skipping CQ checks because original CL landed more than 1 days ago.
BUG=370104,  718080 

Review-Url: https://codereview.chromium.org/2863813002
Cr-Commit-Position: refs/heads/master@{#469638}

[modify] https://crrev.com/b293236194e22d784a5d77a04ebfad88e33f824e/components/metrics/metrics_log.cc
[modify] https://crrev.com/b293236194e22d784a5d77a04ebfad88e33f824e/components/metrics/metrics_log_unittest.cc

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/a0532b2e7b14f5c68d294a2faa6c03315ba5fd93

commit a0532b2e7b14f5c68d294a2faa6c03315ba5fd93
Author: sczs <sczs@chromium.org>
Date: Fri May 05 15:08:02 2017

Revert of Don't set cpu architecture field on iOS in UMA logs. (patchset #2 id:20001 of https://codereview.chromium.org/2671433002/ )

Reason for revert:
This breaks Chrome iOS dashboards because cpu_architecture is the only field where we have the device model info (e.g. iPhone7,2).

Original issue's description:
> Don't set cpu architecture field on iOS in UMA logs.
>
> The value we were setting it to before was not correct, so this
> change instead just makes the value not get set on iOS.
>
> BUG=370104
>
> Review-Url: https://codereview.chromium.org/2671433002
> Cr-Commit-Position: refs/heads/master@{#447578}
> Committed: https://chromium.googlesource.com/chromium/src/+/a86e8e115054ad167458d0379980db5473cb20de

TBR=rkaplow@chromium.org,asvitkine@chromium.org
BUG=370104,  718080 

Review-Url: https://codereview.chromium.org/2855943005
Cr-Commit-Position: refs/heads/master@{#469062}
(cherry picked from commit 9f89092a8f533da1537b0a441b1e137b3d3b2728)

Review-Url: https://codereview.chromium.org/2863143002 .
Cr-Commit-Position: refs/branch-heads/3029@{#803}
Cr-Branched-From: 939b32ee5ba05c396eef3fd992822fcca9a2e262-refs/heads/master@{#454471}

[modify] https://crrev.com/a0532b2e7b14f5c68d294a2faa6c03315ba5fd93/components/metrics/metrics_log.cc
[modify] https://crrev.com/a0532b2e7b14f5c68d294a2faa6c03315ba5fd93/components/metrics/metrics_log_unittest.cc

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/8c13071f30acdea27138d85bb960103f8506f099

commit 8c13071f30acdea27138d85bb960103f8506f099
Author: sczs <sczs@chromium.org>
Date: Fri May 05 15:22:22 2017

Revert of Don't set cpu architecture field on iOS in UMA logs. (patchset #2 id:20001 of https://codereview.chromium.org/2671433002/ )

Reason for revert:
This breaks Chrome iOS dashboards because cpu_architecture is the only field where we have the device model info (e.g. iPhone7,2).

Original issue's description:
> Don't set cpu architecture field on iOS in UMA logs.
>
> The value we were setting it to before was not correct, so this
> change instead just makes the value not get set on iOS.
>
> BUG=370104
>
> Review-Url: https://codereview.chromium.org/2671433002
> Cr-Commit-Position: refs/heads/master@{#447578}
> Committed: https://chromium.googlesource.com/chromium/src/+/a86e8e115054ad167458d0379980db5473cb20de

TBR=rkaplow@chromium.org,asvitkine@chromium.org
BUG=370104,  718080 

Review-Url: https://codereview.chromium.org/2855943005
Cr-Commit-Position: refs/heads/master@{#469062}
(cherry picked from commit 9f89092a8f533da1537b0a441b1e137b3d3b2728)

Review-Url: https://codereview.chromium.org/2860093004 .
Cr-Commit-Position: refs/branch-heads/3071@{#416}
Cr-Branched-From: a106f0abbf69dad349d4aaf4bcc4f5d376dd2377-refs/heads/master@{#464641}

[modify] https://crrev.com/8c13071f30acdea27138d85bb960103f8506f099/components/metrics/metrics_log.cc
[modify] https://crrev.com/8c13071f30acdea27138d85bb960103f8506f099/components/metrics/metrics_log_unittest.cc