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::Close() {
  if (state_ == CLOSED)
    return;

  state_ = CLOSING;
  if (current_buffer_) {
    return;
  }
  state_ = CLOSED;
  CloseInternal();
}

void WebSocketJob::Close() {
  if (state_ == CLOSED)
    return;

  state_ = CLOSING;
  if (current_buffer_) {
    return;
  }
  state_ = CLOSED;
  CloseInternal();
}
