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This reverts commit 65fa1aac.

Reason for revert: Suspect this broke linkedin login credentials.  BUG=894454

Original change's description:
> Reland "[perf] Add browse:media:tumblr:2018 system health story"
> 
> This reverts commit c64ae579.
> 
> Original change's description:
> > [perf] Add browse:media:tumblr:2018 system health story
> >
> > This also add a login helper for tumblr and updates credentials.json
> >
> > Bug: 878390
> > Change-Id: Iba56faf550cb638692899326b217347e04be9932
> > Reviewed-on: https://chromium-review.googlesource.com/c/1256883
> > Reviewed-by: Juan Antonio Navarro Pérez <perezju@chromium.org>
> > Commit-Queue: Ulan Degenbaev <ulan@chromium.org>
> > Cr-Commit-Position: refs/heads/master@{#596763}
> 
> Change-Id: Ib40cc4b8c7f2fe4d23fe3effd285122e703d1601
> Reviewed-on: https://chromium-review.googlesource.com/c/1264382
> Reviewed-by: Ned Nguyen <nednguyen@google.com>
> Commit-Queue: Ulan Degenbaev <ulan@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#598715}

TBR=ulan@chromium.org,perezju@chromium.org,nednguyen@google.com

Change-Id: I8edcf9a3ea4fc2b9fd72cdd5c9f4545bf3a81ca3
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Reviewed-on: https://chromium-review.googlesource.com/c/1278466Reviewed-by: Victor Miura <vmiura@chromium.org>
Commit-Queue: Victor Miura <vmiura@chromium.org>
Cr-Commit-Position: refs/heads/master@{#599018}