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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/1264382Reviewed-by: Ned Nguyen <nednguyen@google.com>
Commit-Queue: Ulan Degenbaev <ulan@chromium.org>
Cr-Commit-Position: refs/heads/master@{#598715}