no need for newlines in DM Errors

This should fix some odd formatting problems in the logs, e.g.

    Note tally:
    583x   (skipped: Cannot convert to requested color type.
    )
    4x     (--blacklist _ image decode 4bpp-pixeldata-cropped.bmp)

~~~>

    Note tally:
    583x   (skipped: Cannot convert to requested color type.)
    4x     (--blacklist _ image decode 4bpp-pixeldata-cropped.bmp)

BUG=skia:

Review URL: https://codereview.chromium.org/1508223006
1 file changed