Import current Fennec LocaleManager.
Import other Fennec files.
Bug 1011008 - Part 0: update stub BrowserLocaleManager.
Bug 1011008 - Part 1: have FxA activities handle locale changes directly.
Bug 1011008 - Part 2: muffle locale changes in SendTabActivity.

We don't actually reflect the locale change, but at least we won't loop.
No bug - Remove redundant import in AndroidConfigurationProvider. r=trivial
Bug 1011008 - Handle system locale changes correctly. r=nalexander