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This reverts commit 40d02af1.

Reason for revert: Broke downstream release builders, and caused
large binary size regression.

Original change's description:
> [Android MR] Migrate session management
> 
> This CL migrates the session management part of MediaRouter.
> CreateRouteRequest is not used and we are using route selection
> to let CAF start sessions automatically.
> 
> Change-Id: I58d267418d9afd11f4f44520e8ca8ad94e82388b
> Reviewed-on: https://chromium-review.googlesource.com/1006358
> Reviewed-by: David Trainor <dtrainor@chromium.org>
> Reviewed-by: Thomas Guilbert <tguilbert@chromium.org>
> Commit-Queue: Zhiqiang Zhang <zqzhang@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#569080}

TBR=dtrainor@chromium.org,zqzhang@chromium.org,tguilbert@chromium.org

Change-Id: I8fae7d4492f873223b5efb3fc3e5d6acef37f981
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 855081, 855025
Reviewed-on: https://chromium-review.googlesource.com/1109981Reviewed-by: agrieve <agrieve@chromium.org>
Commit-Queue: agrieve <agrieve@chromium.org>
Cr-Commit-Position: refs/heads/master@{#569314}