Use Lambda Notation For Non Bind Functions in DrmEngine
Use Lambda Notation For Non Bind Functions in DrmEngine

Replaced all the non-bind functions in DrmEngine to use lambdas.
This is part of the greater "use lambdas everywhere" effort. This function
were easy to do as a group whereas the bind functions need a little
more attention per change.

Change-Id: I4e3207b8f2aed578e880d503605b3d6529524509

tvoli/shaka-player,shaka-project/shaka-player,shaka-project/shaka-player,tvoli/shaka-player,TheModMaker/shaka-player,shaka-project/shaka-player,tvoli/shaka-player,TheModMaker/shaka-player,TheModMaker/shaka-player,TheModMaker/shaka-player,shaka-project/shaka-player,tvoli/shaka-player