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This reverts commit aa57fe6d.

Reason for revert:

Findit (https://goo.gl/kROfz5) identified CL at revision 543005 as the
culprit for failures in the build cycles as shown on:
https://findit-for-me.appspot.com/waterfall/culprit?key=ag9zfmZpbmRpdC1mb3ItbWVyRAsSDVdmU3VzcGVjdGVkQ0wiMWNocm9taXVtL2FhNTdmZTZkYzk2YjQwYTU4YWNjMWVkNmMyNjhmNDdhODgxYjU5MGUM

Sample Failed Build: https://ci.chromium.org/buildbot/chromium.memory/Linux%20MSan%20Tests/8508

Sample Failed Step: browser_tests

Original change's description:
> [Media Router] Converts integration tests to run on Chromium waterfall.
> 
> This updates the Media Router integration tests so they run in the
> Chromium waterfall with the open source Media Router component
> extension and its mock (test) Media Route Provider.
> 
> Additional changes:
> 
> - Removes extension from top level BUILD.gn as it is only used for
>   browser tests at the moment.
> - Splits the targets for Media Router browser tests into integration tests
>   (part of main browser_tests suite), e2e tests (which require the
>   external component extension), perf tests, and shared support code.
> - Renames the "test" extension to the "telemetry" extension used for perf
>   tests to avoid confusion.
> - Updates README files
> - One test is not compatible with the Chromium component and need
>   to be fixed.  Bugs 818767 filed for follow-up.
> 
> Bug: 698796
> Change-Id: I6cc9302ffd72de95630ce33ca3617b3b73b9e722
> Reviewed-on: https://chromium-review.googlesource.com/917214
> Commit-Queue: mark a. foltz <mfoltz@chromium.org>
> Reviewed-by: Scott Violet <sky@chromium.org>
> Reviewed-by: Derek Cheng <imcheng@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#543005}

Change-Id: Ifd1f688a7b89397491d849a6766f8d0510425e05
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 698796
Reviewed-on: https://chromium-review.googlesource.com/962101
Cr-Commit-Position: refs/heads/master@{#543034}