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This reverts commit 29d31a12.

Reason for revert: suspect causing compile failure on linux-chromeos-rel

Sample build: https://ci.chromium.org/p/chromium/builders/ci/linux-chromeos-rel/30980

Original change's description:
> Add App Service Instance related classes.
> 
> Design doc:
> go/app-service-instance-registry-design-doc
> go/appservice-for-per-app-time-limit-design-doc
> 
> This CL adds the App Service Instance classes:
> Instance
> InstanceUpdate
> InstanceRegistry
> 
> InstanceRegistry depends on Instance and InstanceUpdate to calculate
> the instance updates to notify the client.
> 
> BUG=1011235
> 
> Change-Id: Ife2a25c1ae24b3a5c8e1ef67540ba49939126174
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1896484
> Reviewed-by: Dominick Ng <dominickn@chromium.org>
> Commit-Queue: Nancy Wang <nancylingwang@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#712915}

TBR=dominickn@chromium.org,nancylingwang@chromium.org

Change-Id: Ibd6556f36a71a477b4a3515b9d53a6be1cceb3fa
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 1011235
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1900793Reviewed-by: Takashi Sakamoto <tasak@google.com>
Commit-Queue: Takashi Sakamoto <tasak@google.com>
Cr-Commit-Position: refs/heads/master@{#712919}