QuicSession no longer directly owns its QuicConnection. Not flag protected.

net/quic/test_tools/quic_test_utils.h

Index: net/quic/test_tools/quic_test_utils.h
diff --git a/net/quic/test_tools/quic_test_utils.h b/net/quic/test_tools/quic_test_utils.h
index f7d148d0667a52c6e7f1f52a898f62caaf31d2af..fb5ed36b6a57616b40ea21f11c182ca98ec2d7c8 100644
--- a/net/quic/test_tools/quic_test_utils.h
+++ b/net/quic/test_tools/quic_test_utils.h
@@ -498,6 +498,7 @@ class PacketSavingConnection : public MockQuicConnection {
 
 class MockQuicSession : public QuicSession {
  public:
+  // Takes ownership of |connection|.
   explicit MockQuicSession(QuicConnection* connection);
   ~MockQuicSession() override;
 
@@ -554,6 +555,7 @@ class MockQuicSession : public QuicSession {
 
 class MockQuicSpdySession : public QuicSpdySession {
  public:
+  // Takes ownership of |connection|.
   explicit MockQuicSpdySession(QuicConnection* connection);
   ~MockQuicSpdySession() override;
 
@@ -640,6 +642,7 @@ class MockQuicSpdySession : public QuicSpdySession {
 
 class TestQuicSpdyServerSession : public QuicServerSessionBase {
  public:
+  // Takes ownership of |connection|.
   TestQuicSpdyServerSession(QuicConnection* connection,
                             const QuicConfig& config,
                             const QuicCryptoServerConfig* crypto_config,