Merge to XFA: Loosen checking on the bytes following 'stream'

PDF specs say that end of line markers shall follow the
keyword "stream". But a white space before end of line
markers follows this keyword in the test pdf files.

BUG=543018
R=thestig@chromium.org, tsepez@chromium.org

Review URL: https://codereview.chromium.org/1401923005 .
7 files changed