printing: Sandboxed processes must ask the browser to allocate shared memory.

SharedMemory is being changed on Windows so that the underlying File Mapping
Object is always named. This means that sandboxed processes must request the
object from the browser process, just like on POSIX.

BUG=493414

Review URL: https://codereview.chromium.org/1714643002

Cr-Commit-Position: refs/heads/master@{#376335}
1 file changed