Remove dead VP8 test file
Remove dead VP8 test file

Change-Id: I2a4041a440d0e9bbaf4bc85176501e171a5736f8

GrokImageCompression/aom,GrokImageCompression/aom,GrokImageCompression/aom,GrokImageCompression/aom,GrokImageCompression/aom,GrokImageCompression/aom