SendPending() does nothing if socket_stream_ == NULL.
SendPending() does nothing if socket_stream_ == NULL.

It might be socket_stream_ == NULL when SendPending() is called
for wss: URL in websocket_experiment.
SendPending() will be called asynchronously from OnConnected or OnSentData,
and DoClose() might run before SendPending() runs (especially for SSL case).
If socket_stream_ is NULL, it means it must be already closed
and do nothing in SendPending().

BUG=none
TEST=none

Review URL: http://codereview.chromium.org/1632002

git-svn-id: http://src.chromium.org/svn/trunk/src@43810 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

Former-commit-id: c164b4f930bcbe1505657ffc2c922e69670d6218
meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser