Move construction of flow_controller_ to QuicSession constructor to avoid...

Move construction of flow_controller_ to QuicSession constructor to avoid streams being initialized with a NULL ptr.
BUG=

Review URL: https://codereview.chromium.org/442943002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@287700 0039d316-1c4b-4281-b951-d872f2087c98

net/quic/quic_session.cc

@@ -106,9 +106,6 @@ QuicSession::QuicSession(QuicConnection* connection, const QuicConfig& config)
       goaway_received_(false),
       goaway_sent_(false),
       has_pending_handshake_(false) {
-}
-
-void QuicSession::InitializeSession() {
   if (connection_->version() <= QUIC_VERSION_19) {
     flow_controller_.reset(new QuicFlowController(
         connection_.get(), 0, is_server(), kDefaultFlowControlSendWindow,
@@ -120,7 +117,9 @@ void QuicSession::InitializeSession() {
         config_.GetInitialSessionFlowControlWindowToSend(),
         config_.GetInitialSessionFlowControlWindowToSend()));
   }
+}
 
+void QuicSession::InitializeSession() {
   connection_->set_visitor(visitor_shim_.get());
   connection_->SetFromConfig(config_);
   if (connection_->connected()) {