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This reverts commit ffac4483.

Reason for revert:

Findit (https://goo.gl/kROfz5) identified CL at revision 836656 as the
culprit for flakes in the build cycles as shown on:
https://analysis.chromium.org/p/chromium/flake-portal/analysis/culprit?key=ag9zfmZpbmRpdC1mb3ItbWVyQwsSDEZsYWtlQ3VscHJpdCIxY2hyb21pdW0vZmZhYzQ0ODNlNTQ4Y2RmODk3NzJlYmM5ODk5MTM3MDU4OTczOGZjNww

Sample Failed Build: https://ci.chromium.org/b/8860905823939722448

Sample Failed Step: browser_tests

Sample Flaky Test: TranslateModelServiceWithoutOptimizationGuideBrowserTest.TranslateModelServiceEnabled

Original change's description:
> [LanguageDetection] SimpleKeyedService and optimization guide.
> 
> 
> This change converts the translate model service to a
> SimpleKeyedService and moves it to components which will enable
> easier support beyond just browser use cases.
> 
> This change also registers the translate model service to
> the optimization guide for provided necessary model files.
> 
> A future change will add loading and service the model files
> to consumers of the translate model service.
> 
> Bug: 1151407
> Change-Id: I4e903115c82a30757d46d75ed8d733874726d830
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2580339
> Commit-Queue: Michael Crouse <mcrouse@chromium.org>
> Reviewed-by: Colin Blundell <blundell@chromium.org>
> Reviewed-by: Trevor  Perrier <perrier@chromium.org>
> Reviewed-by: Scott Little <sclittle@chromium.org>
> Reviewed-by: Tarun Bansal <tbansal@chromium.org>
> Reviewed-by: Sophie Chang <sophiechang@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#836656}


Change-Id: I9f63ed714aafbe14ce8c48c23474becadd752186
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 1151407
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2591947
Cr-Commit-Position: refs/heads/master@{#836880}