Remove delete_all_alarms and tearDown from Clock tests

Conflicts:
	gaiatest/atoms/gaia_data_layer.js
Migrated the videoplayer app to use marionette By
migrate camera app to marionette By
Migrate music app to use marionette By
migrate contacts app to marionette By
migrate cost control app to marionette By
Migrate gallery app to use marionette By
Migrate calendar app to use marionette By
migrate Browser app to marionette By
migrate email app to marionette By
migrate ev-me app to marionette By
migrate Keyboard app to marionette By