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This reverts commit 5db0bd08.

Reason for revert: Test is failing on Mac10.14 Tests 

Original change's description:
> [system_health] add infinite scrolling for Twitter using performance.mark metrics
> 
> R=​johnchen@chromium.org
> CC=​​cbruni@chromium.org,jdecaires@twitter.com
> 
> Bug: 1114635
> Change-Id: I8d569776bd0f6fdbb656d70172f70c6f08ca3cbe
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2352939
> Auto-Submit: Tamer Tas <tmrts@chromium.org>
> Commit-Queue: Tamer Tas <tmrts@google.com>
> Reviewed-by: John Chen <johnchen@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#799056}

TBR=johnchen@chromium.org,tmrts@chromium.org,tmrts@google.com

Change-Id: I15f87c0a0374759a7d12b61415f38c11df60a537
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 1114635
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2363067Reviewed-by: Chris Sharp <csharp@chromium.org>
Commit-Queue: Chris Sharp <csharp@chromium.org>
Cr-Commit-Position: refs/heads/master@{#799076}