Remove blacklisted native_image_to_raster_surface tests

Bug: skia:6457 skia:6401
Change-Id: I18e45617765aa55c3a2837bb735cefc3d93fad22
Reviewed-on: https://skia-review.googlesource.com/19273
Reviewed-by: Ben Wagner <benjaminwagner@google.com>
Commit-Queue: Brian Osman <brianosman@google.com>
4 files changed