Bug 978944 - Part 1: Extract makePasswordStretcher.
Bug 978944 - Part 2: Try to use NativeCrypto.pbkdf2SHA256.
Bug 978944 - Use Android native code pbkdf2sha256 in FxAccounts. r=rnewman,mcomella
Bug 967022 - Fix Gingerbread progressbar animation bustage.
Bug 967022 - Fix Gingerbread progressbar animation bustage. r=rnewman
Bug 983350 - Part 1: Standardize on Constants.USER_AGENT.
Bug 983350 - Part 2: Add new USER_AGENT strings.
Bug 983350 - Part 3: Add ResourceDelegate.getUserAgent.
Bug 983350 - Part 4: Add User-Agent header tests.
Bug 983350 - Include User-Agent header for FxAccount and TokenServer requests. r=rnewman

This also includes the User-Agent in HealthReport requests.