Bug 1065891 - (Part 1) Remove search engine pref from search activity settings screen. r=liuche
Bug 1065891 - (Part 2) Update the search activity default engine when the gecko default search engine changes. r=bnicholson
Bug 1065891 - (Part 2.5) Add test to make sure search plugin XML file ends up where we expect it to. r=bnicholson
Bug 1065891 - (Part 2.6) Migrate search activity default pref on app update. r=bnicholson