Delete media tests

Media files take up a lot of spce. Deleting them cuts the size of frameworks
almost in half.

Change-Id: I3fd1019df8b41404909b7b4df8ad709526ceff36
Signed-off-by: Evan Anderson <evan1124@gmail.com>

Conflicts:
	media/tests/contents/media_api/goldenThumbnail.png
	media/tests/contents/media_api/videoeditor/IMG_176x144_Overlay1.png
	media/tests/contents/media_api/videoeditor/IMG_176x144_Overlay2.png
	media/tests/contents/media_api/videoeditor/IMG_640x480.png
	media/tests/contents/media_api/videoeditor/IMG_640x480_Overlay1.png
	media/tests/contents/media_api/videoeditor/IMG_640x480_Overlay2.png