Remove redundant check for failure to read a unicode char. ReadUTFChar already checks for valitity and returns the replacement character on failure.
Remove redundant check for failure to read a unicode char. ReadUTFChar already checks for valitity and returns the replacement character on failure.

TEST=none
BUG=none
Review URL: http://codereview.chromium.org/3048014

datacratic/DasDB,datacratic/DasDB,datacratic/DasDB,datacratic/DasDB,datacratic/DasDB