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This reverts commit f8a4ba13.

Reason for revert:
GN modifications broke components_background_task_scheduler_junit_tests

Original change's description:
> Background task scheduler : Split code into public and internal
> 
> This CL separates the public interfaces from the internal code of background
> task scheduler's Java code.
> 
> 1 - The public classes/interfaces are left at top level components/background_task_scheduler
>     while the implementation code is moved to internal/
> 2 - Internal code is moved to a separate package as well.
> 3 - The factory will be a separate target that depends on public and internal.
> 4 - Some classes need to be referenced from both chrome/ and internal code,
>   e.g. BackgroundTaskSchedulerFactory, Uma classes, SharedPref. To handle this,
>   have two classes, e.g. BackgroundTaskSchedulerFactory and BackgroundTaskSchedulerFactoryInternal
> 
> We should probably move the NativeBackgroundTask as well to components/ which
> will greatly help the dependent code to live in components/. Will think about it in a future CL.
> 
> Bug: 1045765
> Change-Id: Idddb3ed33789a735e920f33b7c0f3cb40e5e844a
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2021857
> Commit-Queue: Shakti Sahu <shaktisahu@chromium.org>
> Reviewed-by: David Trainor <dtrainor@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#738560}

TBR=nyquist@chromium.org,dtrainor@chromium.org,shaktisahu@chromium.org

Change-Id: I33c04539e01afae186023e7e011842994d8589ec
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 1045765
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2040373Reviewed-by: Peter Kotwicz <pkotwicz@chromium.org>
Commit-Queue: Peter Kotwicz <pkotwicz@chromium.org>
Cr-Commit-Position: refs/heads/master@{#738707}