Replace QUIC's PathMtuAckListener with a non-AckListener approach. Protected by FLAGS_quic_no_mtu_d…

net/quic/test_tools/quic_test_utils.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.
 //
 // Common utilities for Quic tests
 
 #ifndef NET_QUIC_TEST_TOOLS_QUIC_TEST_UTILS_H_
 #define NET_QUIC_TEST_TOOLS_QUIC_TEST_UTILS_H_
 
 #include <stddef.h>
@@ skipping 798 matching lines @@
 };
 
 class MockNetworkChangeVisitor
     : public QuicSentPacketManagerInterface::NetworkChangeVisitor {
  public:
   MockNetworkChangeVisitor();
   ~MockNetworkChangeVisitor() override;
 
   MOCK_METHOD0(OnCongestionChange, void());
   MOCK_METHOD0(OnPathDegrading, void());
+  MOCK_METHOD1(OnPathMtuIncreased, void(QuicPacketLength));
 
  private:
   DISALLOW_COPY_AND_ASSIGN(MockNetworkChangeVisitor);
 };
 
 class MockQuicConnectionDebugVisitor : public QuicConnectionDebugVisitor {
  public:
   MockQuicConnectionDebugVisitor();
   ~MockQuicConnectionDebugVisitor() override;
 
@@ skipping 105 matching lines @@
     TestQuicSpdyServerSession** server_session);
 
 // Helper to generate client side stream ids, generalizes
 // kClientDataStreamId1 etc. above.
 QuicStreamId QuicClientDataStreamId(int i);
 
 }  // namespace test
 }  // namespace net
 
 #endif  // NET_QUIC_TEST_TOOLS_QUIC_TEST_UTILS_H_