The message this removes gets printed under normal conditions.
Normally dictionary files are compressed then crypted, but not
compressed a second time; however LatinIME tries to open a
compressed-crypted-compressed file first, because it could not
do it afterwards and we want to support this case. So under
normal operations, the first method LatinIME tries is actually
expected to fail.
Also, if we decide to stop compressing or/and encrypting dicts
LatinIME supports it as a valid use case. It should not print
errors to the log.

If the file cannot be open at all, then it is an unexpected
case, and Latin IME still reports to the log.

Change-Id: Ic5228c51365a101af1d03e2c893484d3050b5a1c