Removed unused functions, 'final'ed variables and parameters,
revisited some thread synchronization. Effectively no new code
introduced so no unit tests for this CL.
Change-Id: I714724a98d31a231ab10b0ad468b8efaa460bd1d
Moved testing code to the bottom of the file. The next CL
should be the removal of the DownloadSet. Also fixed b/15003801,
so that the test will not fail.
Change-Id: Ie8320782d6b292d5a367af95d7c58d70a4213ead
This is a straight up copy of the AttachmentDownloadService and
a rename. All the future Attachment work will be done in this
class and we'll flip the switch when it is ready.
Change-Id: I2990cbfd1f7c8e2946c155ea1c124223d0f47ff9
