Merge to M46: 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
TBR=tsepez@chromium.org

Review URL: https://codereview.chromium.org/1401923005 .

(cherry picked from commit b5cbfb4cd12b6499912367f9a1e11c666157acb8)

Review URL: https://codereview.chromium.org/1417623002 .
7 files changed