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CL migrates CustomizationWallpaperDownloader away from URLFetcher et al
to use SimplerURLLoader (network services).

In the associated browsertests** it also simplifies the implementation
a lot by making use of EmbeddedTestServer rather than the URLFetcher
and FakeURLFetcherFactory machinery.

**customization_wallpaper_downloader_browsertest.cc

BUG=773295
TEST=CustomizationWallpaperDownloaderBrowserTest.*

Change-Id: I881ccb8749377a0043f15edfe20c223c57c5ea51
Reviewed-on: https://chromium-review.googlesource.com/1012877Reviewed-by: Matt Menke <mmenke@chromium.org>
Reviewed-by: Steven Bennetts <stevenjb@chromium.org>
Commit-Queue: Antonio Gomes <tonikitoo@igalia.com>
Cr-Commit-Position: refs/heads/master@{#551067}