Remove PPAPI dependency on 'net'.

Remove PPAPI dependency on 'net'.
This is needed to complete the port of the PPAPI proxy plugin-side to NaCl.
This replaces usages in ppapi of types in 'net' with simpler base types (eg. instead of IPEndPoint, use a std::vector<unsigned char> address  and an int port). Also, this removes some static methods in net_address_private_impl.* that are hardly used, and removes the ppapi::NetAddressList typedef, using std::vector<PP_NetAddress_Private> instead.
BUG=116317
TEST=existing, no new functionality
Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=156585

[bbudge, 2012-09-12 17:52:24]

Ready. Most of the action is in net_address_private_impl.cc. I adapted two
methods from net::IPEndPoint, and added defs for sys/socket.h for NaCl since
they don't exist. It's not really needed yet though.

The rest is just replacing 'net' structs and classes with non-net types.

[bbudge, 2012-09-12 17:52:34]

Ready. Most of the action is in net_address_private_impl.cc. I adapted two
methods from net::IPEndPoint, and added defs for sys/socket.h for NaCl since
they don't exist. It's not really needed yet though.

The rest is just replacing 'net' structs and classes with non-net types.

[bbudge, 2012-09-12 22:58:13]

Removed copied "sys/socket.h" defines for NaCl untrusted build. They won't be
needed.

[brettw, 2012-09-13 18:00:27]

lgtm