olly 5ab0c620bf Clean up ClearKey UUIDs
- There is a proper ClearKey UUID now. This change requires
  it to be used instead of the Common PSSH UUID when instantiating
  DRM components.
- Internally, we'll map the ClearKey UUID onto the Common PSSH
  UUID where necessary to (a) access the ClearKey CDM on older
  devices, and (b) access drm init data stored under the Common
  PSSH UUID in the stream.

Issue: #3138

-------------
Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=164839213
2017-08-10 13:25:32 +01:00
..
2017-08-10 13:25:32 +01:00