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This reverts commit b011ab56.

Reason for revert: caused test failures -- see crbug/897352

Original change's description:
> Upgrade image file management for Win 10 native notification
> 
> This CL makes the following changes:
> 1) Change to run image folder cleanup after Chrome startup using a background
>    task, rather than running it at Chrome shutdown using a high priority task.
> 2) Retain the image folder to avoid deleting and creating it repeatedly.
> 3) Remove <subdir> from the full path for the temp file, which is unnecessary.
> 4) Delete the temp files in batch.
> 
> These changes have the following benefits:
> 1) Fix the issue of Chrome shutdown being blocked by image file IO for some users
>    as in the current implementation.
> 2) Save some disk IO related to the sub-directories in the image folder and the
>    image folder itself.
> 3) Avoid creating a deletion task for each file, otherwise the overhead can be
>    large when there is a steady stream of notifications coming rapidly.
> 
> Bug: 888276
> Change-Id: I214680aa00bd7f19e84e207e82ada553583a094b
> Reviewed-on: https://chromium-review.googlesource.com/c/1260498
> Commit-Queue: Xi Cheng <chengx@chromium.org>
> Reviewed-by: Ilya Sherman <isherman@chromium.org>
> Reviewed-by: Greg Thompson <grt@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#601227}

TBR=isherman@chromium.org,finnur@chromium.org,grt@chromium.org,chengx@chromium.org

Change-Id: Ie79e62373c0076346499e450e48c2d16b55c6dc4
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 888276, 897352
Reviewed-on: https://chromium-review.googlesource.com/c/1292834Reviewed-by: Xi Cheng <chengx@chromium.org>
Commit-Queue: Xi Cheng <chengx@chromium.org>
Cr-Commit-Position: refs/heads/master@{#601376}