Bug 823025 - Call Log: Returning from contact details should go back to call log, not contact list.

When user click back button in contact details page in iframe, the iframe will post message to Dialer app. After receive back message, Dialer app will show Call log page.
Merge pull request #7836 from evanxd/bug-823025-5

Bug 823025 - Call Log: Returning from contact details should go back to call log, not contact list, r=etiennesegonzac, a=approval-gaia-v1.