Most of the utils are really GeckoView utilities, but some are strictly Fennec (e.g., Experiments). Along the way, things like https://reviewboard.mozilla.org/r/60458/diff/1#index_header will need to be addressed. This looks like adding a new JAR to mobile/android/base/moz.build, or (much easier) just moving some of the files from base/utils into a new directory and including them into the gecko-browser JAR. This doesn't strictly require Bug 1291363, but it's probably easiest if that lands first, because then it's more clear that we're moving things *back* from mobile/android/geckoview to m/a/base, which is Fennec.
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