Merge pull request #18217 from etiennesegonzac/bug-993807-network-initiated-mmi

Bug 993807 - Making sure the MmiManager is initialized for network initiated MMI sessions. r=rik
Bug 969609 - [B2G][Email]Opening an email notification then pressing back in the email app leads to a black screen.

Manual v1.3 branch merge from master commit 2a439c1dd68b9336b7b0ff14df9b742943aa61bf
Merge pull request #18493 from jrburke/bug969609-v1.3-email-notification-black-screen

Bug 969609 - [B2G][Email]Opening an email notification then pressing back in the email app leads to a black screen. r=asuth a=bajaj
Bug 985598 - [email] Double-triggering of share/new activity by clicking on a mailto link results in black screen

v1.3 branch merge from master of commit c3b1f1fe0ee3e00903858333412b6de94f194629
Merge pull request #18495 from jrburke/bug985598-v1.3-email-double-activity-blank

Bug 985598 - [email] Double-triggering of share/new activity by clicking on a mailto link results in black screen r=asuth a=bajaj