Remove impossible mojo/public/cpp/system file from nacl build

file_data_pipe_producer.cc refers to the base::File::File(path, flags)
constructor which does not exist (dangling symbol) in nacl builds. It
can work anyway if the whole object file is unused and gets ignored
by the linker. That didn't happen in jumbo build experiments where
file_data_pipe_producer.cc was combined with other files before being
compiled.

So let's not compile dead code that would not be possible to link anyway.

Change-Id: I39de768fb241bee2111bd29a516c5973951cdbd0
Reviewed-on: https://chromium-review.googlesource.com/c/1268320
Reviewed-by: Ken Rockot <rockot@chromium.org>
Commit-Queue: Daniel Bratell <bratell@opera.com>
Cr-Commit-Position: refs/heads/master@{#598357}
1 file changed