Merge pull request #8254 from steveck-chung/MMS_resize_utility

Bug 840038 - [MMS][User Story] Image rescaling to 300kB. r=borjasalguero(cherry picked from commit 16bb4eb76b240a3f5f7e080bdc1864e0f6148729)

Conflicts:
	apps/sms/js/utils.js