Use ScopedRunnableMethodFactory in WebSocketJob

Don't post SendPending if it is already posted.

BUG=89795
TEST=none

Review URL: http://codereview.chromium.org/7488007

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@93599 0039d316-1c4b-4281-b951-d872f2087c98
 void WebSocketJob::CloseInternal() {
  if (spdy_websocket_stream_.get())
    spdy_websocket_stream_->Close();
  if (socket_.get())
    socket_->Close();
}

 void WebSocketJob::CloseInternal() {
  if (spdy_websocket_stream_.get())
    spdy_websocket_stream_->Close();
  if (socket_.get())
    socket_->Close();
}
