Bug_900159 - Factor shared/js/device_storage_utils by creating separate files under shared/device_storage/ r=davidflanagan
Merge pull request #11387 from punamdahiya/Bug_900159

Bug_900159 - Factor shared/js/device_storage_utils.js r=dhylands, davidflanagan

The travis errors seem to be from earlier merges, so I'm going to merge anyways.