Revert "Bug 763056 - Remove deprecated assert methods from MozMillController class. r=hskupin"

This reverts commit fe59172863b706d8512a7b7fbdc44de177f51dfc.
Revert "Bug 989298 - Remove deprecated event methods from MozMillController class. r=hskupin"

This reverts commit dabf3313d606ce36d906648ad2d67c0ad3a054bc.