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Revert "Plumb URLs through memory_instrumentation UKMs."

This reverts commit 1d8d254c.

Reason for revert: Fails on win7:
https://build.chromium.org/p/chromium.win/builders/Win7%20Tests%20%28dbg%29%281%29/builds/61933

Original change's description:
> Plumb URLs through memory_instrumentation UKMs.
> 
> The URLs are obtained by creating a new interface CoordinationUnitIntrospector
> on the resource_coordinator service. The implementation of this interface crawls
> all ProcessCoordinationUnits, and creates a map from pid to hosted URLs by
> looking at associated FrameCoordinationUnits.
> 
> The interface for memory_instrumentation is modified slightly to include pid in
> ProcessMemoryDump to allow correlation between the memory dump and the URLs
> obtained from resource_coordinator. In a hypothetical future world where
> memory_instrumentation and resource_coordinator live in the same service, this
> can be removed.
> 
> Bug:730783
> 
> Cq-Include-Trybots: master.tryserver.chromium.linux:linux_site_isolation
> Change-Id: Ia1de1af692df4d7d08239db91c9fd14b71a15b70
> Reviewed-on: https://chromium-review.googlesource.com/578482
> Commit-Queue: Erik Chen <erikchen@chromium.org>
> Reviewed-by: Daniel Cheng <dcheng@chromium.org>
> Reviewed-by: Lei Zhang <thestig@chromium.org>
> Reviewed-by: Robert Kaplow <rkaplow@chromium.org>
> Reviewed-by: Oystein Eftevaag <oysteine@chromium.org>
> Reviewed-by: Primiano Tucci <primiano@chromium.org>
> Reviewed-by: Avi Drissman <avi@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#490668}

TBR=avi@chromium.org,dcheng@chromium.org,thestig@chromium.org,primiano@chromium.org,rkaplow@chromium.org,erikchen@chromium.org,oysteine@chromium.org

Change-Id: I0120cea65f8e95f787d15579e427b9b3bab86187
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 730783
Cq-Include-Trybots: master.tryserver.chromium.linux:linux_site_isolation
Reviewed-on: https://chromium-review.googlesource.com/593213Reviewed-by: Nico Weber <thakis@chromium.org>
Commit-Queue: Nico Weber <thakis@chromium.org>
Cr-Commit-Position: refs/heads/master@{#490685}