Do not set valueDecoded until after the value is decoded

(cherry-picked from a5cc81bb305432bae2fe6d007a992ec1ede0b387)

Bug: https://code.google.com/p/chromium/issues/detail?id=233610
Bug: 8712523
Change-Id: I60e9d948419a177f1982649554e07fc65d061d75
1 file changed