Fix memory leak in JingleSessionTest.Connect and friends

Private key is cloned instead of transferred. This eliminates the leak in
JingleSessionTest.*.

BUG=70291
TEST=valgrind bot is green

Review URL: http://codereview.chromium.org/6317009

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@72164 0039d316-1c4b-4281-b951-d872f2087c98

remoting/protocol/jingle_session_manager.cc

@@ -288,7 +288,7 @@ void JingleSessionManager::OnSessionCreate(
     }
     JingleSession* jingle_session =
         JingleSession::CreateServerSession(this, certificate_,
-                                           private_key_.release());
+                                           private_key_.get());
     certificate_ = NULL;
     sessions_.push_back(make_scoped_refptr(jingle_session));
     jingle_session->Init(cricket_session);