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Revert of [Chromoting] Retrieve process resource usage (ProcessStats) and its tests (patchset #9 id:240001 of https://codereview.chromium.org/2775983003/ )

Reason for revert:
Breaks x86-alex-tot-chrome-pfq-informational build: https://uberchromegw.corp.google.com/i/chromeos.chrome/builders/x86-alex-tot-chrome-pfq-informational/builds/23688

Original issue's description:
> [Chromoting] Retrieve process resource usage (ProcessStats) and its tests
>
> ProcessStatsStub is an interface to receive process resource usage information
> from a ProcessStats.
>
> ProcessResourceUsage is a structure to store the resource usage of one process.
> AggregatedProcessResourceUsage is a structure to store the resource usgaes of
> several processes.
>
> ProcessStatsAgent is an interface to retrieve resource usage of one process.
> CurrentProcessStatsAgent is a ProcessStatsAgent implementation to retrieve
> resource usage from current process.
> ForwardProcessStatsAgent receives resource usage from a third-party and forwards
> the latest usage as a ProcessStatsAgent.
>
> ProcessStatsSender is a class to regularly report resource usages from various
> ProcessStatsAgent implementations to a ProcessStatsStub. It merges several
> non-empty ProcessResourceUsage into one AggregatedProcessResourceUsage.
> This is typical useful on Windows: we need to calculate the resource usages from
> both network process and desktop process.
>
> R=sergeyu@chromium.org, jamiewalch@chromium.org
> BUG=650926
>
> Review-Url: https://codereview.chromium.org/2775983003
> Cr-Commit-Position: refs/heads/master@{#467753}
> Committed: https://chromium.googlesource.com/chromium/src/+/5928f440f84065ab45f848dcd135e3c2f52ca5bb

TBR=jamiewalch@chromium.org,sergeyu@chromium.org,joedow@chromium.org,zijiehe@chromium.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=650926

Review-Url: https://codereview.chromium.org/2847743004
Cr-Commit-Position: refs/heads/master@{#467786}