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This reverts commit 4da4d1e4.

Reason for revert: linkage failures:
bin/ld.lld: error: undefined symbol: NotificationUIManager::Create()
>>> referenced by browser_process_impl.cc:1198 (../../chrome/browser/browser_process_impl.cc:1198)
>>>               browser/browser_process_impl.o:(BrowserProcessImpl::CreateNotificationUIManager()) in archive obj/chrome/browser/libbrowser.a
clang: error: linker command failed with exit code 1 (use -v to see invocation)
ninja: build stopped: subcommand failed.

Original change's description:
> Chrome OS: remove non-native notifications codepaths.
> 
> Only support native notifications, i.e. those passed over mojo.
> 
> Some tests are permanently removed on Chrome OS. Some tests are
> migrated to message_center_unittests.
> 
> Bug: 578868
> Change-Id: Ibd4edcd1968c94af2d24b15ed3c1329ea7bf49b1
> Reviewed-on: https://chromium-review.googlesource.com/1083937
> Reviewed-by: Steven Bennetts <stevenjb@chromium.org>
> Reviewed-by: Scott Violet <sky@chromium.org>
> Commit-Queue: Evan Stade <estade@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#564928}

TBR=stevenjb@chromium.org,sky@chromium.org,estade@chromium.org

Change-Id: I91f175ba1d9d23545c4377c8c131d6c0170431db
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 578868
Reviewed-on: https://chromium-review.googlesource.com/1089471Reviewed-by: Evan Stade <estade@chromium.org>
Commit-Queue: Evan Stade <estade@chromium.org>
Cr-Commit-Position: refs/heads/master@{#564986}