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The SfPlayer class was implementing URI and FD decode and playback
 in the application process. This CL removes this class entirely
 and moves its functionality under the GenericPlayer class. This
 means that the playback of URIs and FDs is now implemented through
 an android::MediaPlayer object running in the media service.

The SfPlayer header had many StageFright and system includes, which
 are now moved to the relevant files where they are required,
 instead of automagically coming from sles_allinclusive.h.

Note that this CL breaks support for the following OpenSL ES features
due to missing Android MediaPlayer features:
 SLPlayItf.GetPosition
           HEADATMARKER
           HEADATNEWPOSITION
 SLVolumeItf.EnableStereoPosition
           SetStereoPosition
 SLMuteSoloItf
 SLPlaybackRateItf

 Support for those features will be reintegrated in subsequent CLs.

Change-Id: I8d7f6ea006eb7b876ef1ca1909d74b4517335850