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Grouping the ash service and ui service into the same process broke
image cursors. Fix it by providing the necessary task runner for cursor
resource loading. Make MashServiceRegistry into a class so it can hold
the cursor set.

Also refactor ui::Service InitParams to make it more clear when it is
running in-process vs. out-of-process.

Bug: 722527
Test: Run chrome --mash, hovering NTP tiles has hand cursor
Change-Id: Ie2b3fc9d523af9f06e16a1b6137f8481182169de
Reviewed-on: https://chromium-review.googlesource.com/832996Reviewed-by: Scott Violet <sky@chromium.org>
Reviewed-by: Ken Rockot <rockot@chromium.org>
Reviewed-by: Sadrul Chowdhury <sadrul@chromium.org>
Commit-Queue: James Cook <jamescook@chromium.org>
Cr-Commit-Position: refs/heads/master@{#526998}