Merge to XFA: Prevent divide by zeros in CJBig2_GSIDProc::decode_MMR().

Check the image size before attempting to decode.

BUG=538103
TBR=tsepez@chromium.org

Review URL: https://codereview.chromium.org/1377493005 .

(cherry picked from commit 9fb70fbded5c0bf4f5313a49fd3496b4d4fa71ca)

Review URL: https://codereview.chromium.org/1379233003 .
1 file changed