Fix test_image_unittest
Fix test_image_unittest

BUG=None
TEST=the unittest does not fail anymore

Change-Id: Iadb083a9bc2ee6eed9f7dcfa57ba88b8a000c57e
Reviewed-on: https://chromium-review.googlesource.com/208792
Tested-by: Yu-Ju Hong <52dc720c411f8e2156e608c1a8b894a917489667@chromium.org>
Reviewed-by: Don Garrett <546ec366615570e68497e3c5df9092106a9808f4@chromium.org>
Commit-Queue: Yu-Ju Hong <52dc720c411f8e2156e608c1a8b894a917489667@chromium.org>

bpsinc-native/src_third_party_chromite,bpsinc-native/src_third_party_chromite,bpsinc-native/src_third_party_chromite