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This reverts commit 4b79ed37.

Reason for revert: Causes crashes on Chrome OS - see https://crbug.com/1047222.

Original change's description:
> Reland "[Structured metrics] Add metric collection and upload logic."
> 
> This is a reland of 2fe77415
> 
> Original change's description:
> > [Structured metrics] Add metric collection and upload logic.
> > 
> > This is the final CL for the core of the structured metrics system. It
> > ties together the KeyData class (for managing keys and computing hashes)
> > with the metrics provider, and implements logic to:
> > 
> >  1. Hash and store incoming structured metrics events.
> >  2. Provide stored metrics events for upload.
> > 
> > It also adds integration tests for the system, checking that an event
> > created through the public API is correctly prepared for upload.
> > 
> > Other misc changes:
> > 
> >  - Some minor refactoring of event_base.{h,cc} and equivalent changes
> >    to events_template.py, to fix some bad style.
> >  - Added a missing RemoveObserver call to the metrics provider dtor.
> > 
> > Bug: 1016655
> > Change-Id: I3daae2ba7927742d26db8d5750538584bf13b94f
> > Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1975386
> > Commit-Queue: Tony Yeoman <tby@chromium.org>
> > Reviewed-by: Andrew Moylan <amoylan@chromium.org>
> > Cr-Commit-Position: refs/heads/master@{#735748}
> 
> Bug: 1016655
> Change-Id: I83e69de7a9b865d35036b714f068cfda3c423b76
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2026913
> Reviewed-by: Andrew Moylan <amoylan@chromium.org>
> Commit-Queue: Tony Yeoman <tby@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#736590}

TBR=amoylan@chromium.org,tby@chromium.org

Change-Id: I06ea1c7935600f26a7afbd2ec81a4c0f11277a70
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 1016655
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2030968Reviewed-by: Maksim Ivanov <emaxx@chromium.org>
Commit-Queue: Maksim Ivanov <emaxx@chromium.org>
Cr-Commit-Position: refs/heads/master@{#736890}