Remove timing limitation of SetOption invocation for PPAPI sockets.
Currently PPAPI has timing limitation for sockets' SetOption.
NODELAY, and BROADCAST need to be before Connect() or Bind(),
while RCVBUF_SIZE and SNFBUF_SIZE need to be after it.
This CL removes such a limitation.
Along with the change, pepper_udp_socket_message_filter starts to use UDPSocket instead of UDPServerSocket, so that the implementation direction gets closer to TCP message filter a little bit.
BUG=425563, 420697
TEST=Ran trybots.
Review URL: https://codereview.chromium.org/690903002
Cr-Commit-Position: refs/heads/master@{#307867}
29 files changed
