Revert of Remove the code to store and load QUIC server configs in the disk cache.

net/quic/chromium/quic_stream_factory_peer.cc

Index: net/quic/chromium/quic_stream_factory_peer.cc
diff --git a/net/quic/chromium/quic_stream_factory_peer.cc b/net/quic/chromium/quic_stream_factory_peer.cc
index d5f4b5ca35dbc63cdb6c49bc4332deb991bdd849..ff05043687802dccfbb3a59ee29e0f70bdded6d4 100644
--- a/net/quic/chromium/quic_stream_factory_peer.cc
+++ b/net/quic/chromium/quic_stream_factory_peer.cc
@@ -117,6 +117,20 @@
   if (it == factory->active_jobs_.end())
     return 0;
   return it->second.size();
+}
+
+void QuicStreamFactoryPeer::MaybeInitialize(QuicStreamFactory* factory) {
+  factory->MaybeInitialize();
+}
+
+bool QuicStreamFactoryPeer::HasInitializedData(QuicStreamFactory* factory) {
+  return factory->has_initialized_data_;
+}
+
+bool QuicStreamFactoryPeer::SupportsQuicAtStartUp(QuicStreamFactory* factory,
+                                                  HostPortPair host_port_pair) {
+  return base::ContainsKey(factory->quic_supported_servers_at_startup_,
+                           host_port_pair);
 }
 
 bool QuicStreamFactoryPeer::CryptoConfigCacheIsEmpty(