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* Put calls to other "ensure factories built" metafunctions before
  calls to build specific factories.
* Name all the metafunctions
  EnsureBrowserContextKeyedServiceFactoriesBuilt().
* Alphabetize.
* Remove unnecessary blank lines.
* Remove no-longer-applicable comments.

Bug: none
Change-Id: Ibc17ccc32d16b0cd8692cbea719ded3c9de9d662
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2134621
Auto-Submit: Peter Kasting <pkasting@chromium.org>
Commit-Queue: Scott Violet <sky@chromium.org>
Reviewed-by: Scott Violet <sky@chromium.org>
Cr-Commit-Position: refs/heads/master@{#756097}