olly 7f70ee911b Clean up chunked Sample/Chunk sources.
- Remove need for SampleSources to ref ChunkSources.
- Correctly propagate errors loading manifests through
  ChunkSource components.
- Fix some misc warnings.
-------------
Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=123732918
2016-06-15 19:42:02 +01:00
..
2016-06-15 19:41:53 +01:00