remove references to obsolete test files

These files have been removed from test/test-data.mk. When they are not
found, new versions are encoded. However, if they happen to exist, the
tests fail due to the unsupported bitstreams.

Change-Id: Ib643a5a22608b20df2b8f520691ba213f07837e1

test/tools_common.sh

@@ -442,11 +442,11 @@ fi
 
 # Variables shared by tests.
 VP8_IVF_FILE="${LIBAOM_TEST_DATA_PATH}/vp80-00-comprehensive-001.ivf"
-AV1_IVF_FILE="${LIBAOM_TEST_DATA_PATH}/vp90-2-09-subpixel-00.ivf"
+AV1_IVF_FILE=""
 
-AV1_WEBM_FILE="${LIBAOM_TEST_DATA_PATH}/vp90-2-00-quantizer-00.webm"
-AV1_FPM_WEBM_FILE="${LIBAOM_TEST_DATA_PATH}/vp90-2-07-frame_parallel-1.webm"
-AV1_LT_50_FRAMES_WEBM_FILE="${LIBAOM_TEST_DATA_PATH}/vp90-2-02-size-32x08.webm"
+AV1_WEBM_FILE=""
+AV1_FPM_WEBM_FILE=""
+AV1_LT_50_FRAMES_WEBM_FILE=""
 
 YUV_RAW_INPUT="${LIBAOM_TEST_DATA_PATH}/hantro_collage_w352h288.yuv"
 YUV_RAW_INPUT_WIDTH=352