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This reverts commit 1c479eb8.

Reason for revert: <INSERT REASONING HERE>

Original change's description:
> Refactor BrowserDMTokenStorage for easier platform implementations.
> 
> This CL refactors BrowserDMTokenStorage & BrowserDMTokenStorageWin to move code that is common to all platforms.
> 
> After this CL, adding a new platform requires implementing the following methods:
> 
> -  virtual std::string InitClientId();
> -  virtual std::string InitEnrollmentToken();
> -  virtual std::string InitDMToken();
> -  virtual void SaveDMToken(const std::string& token);
> 
> Note that this CL keeps the existing Windows implementation, it only refactors the code (no functional change).
> 
> BUG=812641
> 
> Change-Id: If362c4368160e7bd038a8a4b1d93e151c0a60e1b
> Reviewed-on: https://chromium-review.googlesource.com/1133315
> Commit-Queue: Georges Khalil <georgesak@chromium.org>
> Reviewed-by: Julian Pastarmov <pastarmovj@chromium.org>
> Reviewed-by: Roger Tawa <rogerta@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#575276}

TBR=rogerta@chromium.org,pastarmovj@chromium.org,georgesak@chromium.org,zmin@chromium.org

Change-Id: Idbf78da964051aaac710b780fabccf248c8d583e
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 812641
Reviewed-on: https://chromium-review.googlesource.com/1138513Reviewed-by: Owen Min <zmin@chromium.org>
Commit-Queue: Owen Min <zmin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#575281}