Make preparser-process.cc ignore flags on the command line.
Make preparser-process.cc ignore flags on the command line.

Avoids breaking when passed, e.g., the --nosse2 flag by certain builders.

Review URL: http://codereview.chromium.org/6964008

git-svn-id: b158db1e4b4ab85d4c9e510fdef4b1e8c614b15b@7821 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

UniversalFuture/moosh,UniversalFuture/moosh,UniversalFuture/moosh,UniversalFuture/moosh