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This reverts commit 23e967ba.

Reason for revert: Chrome kept crashing when trying to log in on the login screen. See crbug.com/820302 for details.

Bug: 820302

Original change's description:
> Migrate ServicesCustomizationDocument to SimpleURLLoader
> 
> Bug: 773295
> Change-Id: Id129cea8341c14bd8da4b5374034423223f03859
> Reviewed-on: https://chromium-review.googlesource.com/884063
> Commit-Queue: Mark Pilgrim <pilgrim@chromium.org>
> Reviewed-by: James Cook <jamescook@chromium.org>
> Reviewed-by: Matt Menke <mmenke@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#541884}

TBR=jamescook@chromium.org,mmenke@chromium.org,pilgrim@chromium.org

Change-Id: Ibaf3b0e0f98edf34f79374e85101b705418e7588
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 773295
Reviewed-on: https://chromium-review.googlesource.com/956763Reviewed-by: Xiaoqian Dai <xdai@chromium.org>
Commit-Queue: Xiaoqian Dai <xdai@chromium.org>
Cr-Commit-Position: refs/heads/master@{#541964}