QUIC enable server push by default. Guarded by FLAGS_quic_enable_server_push_by_default.

net/quic/core/quic_server_session_base.h

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 //
 // A server specific QuicSession subclass.
 
 #ifndef NET_QUIC_QUIC_SERVER_SESSION_BASE_H_
 #define NET_QUIC_QUIC_SERVER_SESSION_BASE_H_
 
 #include <stdint.h>
@@ skipping 77 matching lines @@
   }
 
   // Override base class to process bandwidth related config received from
   // client.
   void OnConfigNegotiated() override;
 
   void set_serving_region(const std::string& serving_region) {
     serving_region_ = serving_region;
   }
 
-  bool server_push_enabled() const { return server_push_enabled_; }
-
  protected:
   // QuicSession methods(override them with return type of QuicSpdyStream*):
   QuicCryptoServerStreamBase* GetCryptoStream() override;
 
   // If an outgoing stream can be created, return true.
   // Return false when connection is closed or forward secure encryption hasn't
   // established yet or number of server initiated streams already reaches the
   // upper limit.
   bool ShouldCreateOutgoingDynamicStream() override;
 
   // If we should create an incoming stream, returns true. Otherwise
   // does error handling, including communicating the error to the client and
   // possibly closing the connection, and returns false.
   bool ShouldCreateIncomingDynamicStream(QuicStreamId id) override;
 
   virtual QuicCryptoServerStreamBase* CreateQuicCryptoServerStream(
       const QuicCryptoServerConfig* crypto_config,
       QuicCompressedCertsCache* compressed_certs_cache) = 0;
 
   const QuicCryptoServerConfig* crypto_config() { return crypto_config_; }
 
-  void set_server_push_enabled(bool enable) { server_push_enabled_ = enable; }
-
   Visitor* visitor() { return visitor_; }
 
   QuicCryptoServerStream::Helper* stream_helper() { return helper_; }
 
  private:
   friend class test::QuicServerSessionBasePeer;
   friend class test::QuicSimpleServerSessionPeer;
 
   const QuicCryptoServerConfig* crypto_config_;
 
@@ skipping 23 matching lines @@
 
   // Number of packets sent to the peer, at the time we last sent a SCUP.
   int64_t last_scup_packet_number_;
 
   // Converts QuicBandwidth to an int32 bytes/second that can be
   // stored in CachedNetworkParameters.  TODO(jokulik): This function
   // should go away once we fix http://b//27897982
   int32_t BandwidthToCachedParameterBytesPerSecond(
       const QuicBandwidth& bandwidth);
 
-  // Set during handshake. If true, resources in x-associated-content and link
-  // headers will be pushed. see: go/gfe_server_push.
-  bool server_push_enabled_;
-
   DISALLOW_COPY_AND_ASSIGN(QuicServerSessionBase);
 };
 
 }  // namespace net
 
 #endif  // NET_QUIC_QUIC_SERVER_SESSION_BASE_H_