Cast:Moving netwrok sender related code to a designated folder

This cl is a first step in splitting up the cast library. At the end of this effort, the cast sender will be split into two: Generic protocol and encoding remain as is, all handling of coded frames to transmission will be in a designated folder (currently named net). 

This cl ONLY handles the moving of the files.
Future cl's will include:
 - New cast_net API
 - Adding RTCP handling
 - Designated target (and namespace)

BUG=327482

Review URL: https://codereview.chromium.org/112133002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@240166 0039d316-1c4b-4281-b951-d872f2087c98
[NaCl SDK] Add FUSE mount.

This is an initial implementation of the FUSE interface, to allow extending the
types of mounts nacl_io supports.

BUG=none
R=sbc@chromium.org

Review URL: https://codereview.chromium.org/108803003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@240167 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 240166
SVN changes up to revision 240167