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This reverts commit 34b11e87.

Reason for revert: Causing crashes: crbug.com/742707

Original change's description:
> Add the VariationsFieldTrialCreator class
> 
> This is part 3 of 6 for FieldTrial refactoring for WebView
> 
> Part 1: https://chromium-review.googlesource.com/c/562098/
> Part 2: https://chromium-review.googlesource.com/c/561920/
> Part 3: https://chromium-review.googlesource.com/c/561922/
> Part 4: https://chromium-review.googlesource.com/c/561980/
> Part 5: https://chromium-review.googlesource.com/c/562417/
> Part 6: https://chromium-review.googlesource.com/c/562021/
> 
> This CL creates the VariationsFieldTrialCreator class. This class
> contains the code previously in VariationsService that
> is needed by both Chrome and WebView, mainly the portions
> needed to call CreateTrialsFromSeed.  The VariationsService
> class now contains an instance of this new class.
> 
> BUG=678288
> 
> Change-Id: Ic4340d5a0396cca56892a3b541e4cf6115bb8afb
> Reviewed-on: https://chromium-review.googlesource.com/561922
> Commit-Queue: Kyle Milka <kmilka@google.com>
> Reviewed-by: Alexei Svitkine (slow) <asvitkine@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#486590}

TBR=asvitkine@chromium.org,timav@chromium.org,paulmiller@chromium.org,kmilka@google.com

Change-Id: Idf0f12b5bd6d1bb7edf41cbdc6f767f8790de6e9
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 678288
Reviewed-on: https://chromium-review.googlesource.com/571920Reviewed-by: Alexei Svitkine (slow) <asvitkine@chromium.org>
Commit-Queue: Alexei Svitkine (slow) <asvitkine@chromium.org>
Cr-Commit-Position: refs/heads/master@{#486755}