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This reverts commit 8904382c.

Reason for revert: This CL breaks AppStateTest.resumeSessionWithStartupParameters for iOS 12 devices. See https://ci.chromium.org/ui/p/chrome/builders/ci/iphone-device/15349/blamelist.

Original change's description:
> [iOS] Fix Session.TotalDuration metric with multiwindow.
>
> Track the session as open while there is at least one foreground window.
> Log this in a dedicated app agent to avoid polluting AppState.
> The same is done to IOSProfileSessionDurationsService's session
> start/end events.
>
> Bug: 1156586
> Change-Id: I37586f989039206fbaa90f7ec4046fbf9582e70a
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2599870
> Commit-Queue: Stepan Khapugin <stkhapugin@chromium.org>
> Auto-Submit: Stepan Khapugin <stkhapugin@chromium.org>
> Reviewed-by: Mark Pearson <mpearson@chromium.org>
> Reviewed-by: Mihai Sardarescu <msarda@chromium.org>
> Reviewed-by: Mark Cogan <marq@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#845653}

TBR=mpearson@chromium.org,marq@chromium.org,msarda@chromium.org,stkhapugin@chromium.org,chromium-scoped@luci-project-accounts.iam.gserviceaccount.com

Change-Id: Icd927a3252658933c02c8101067657f3ac7365b2
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 1156586
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2643264Reviewed-by: Mike Dougherty <michaeldo@chromium.org>
Commit-Queue: Mike Dougherty <michaeldo@chromium.org>
Cr-Commit-Position: refs/heads/master@{#845730}