Delete dead function: QuicConnection::SelectMutualVersion()

PiperOrigin-RevId: 770673966

quiche/quic/core/quic_connection.cc

diff --git a/quiche/quic/core/quic_connection.cc b/quiche/quic/core/quic_connection.cc
index 74ac6e4..a0bc854 100644
--- a/quiche/quic/core/quic_connection.cc
+++ b/quiche/quic/core/quic_connection.cc
@@ -748,25 +748,6 @@
   return sent_packet_manager_.ApplicationDrivenPacingRate();
 }
 
-bool QuicConnection::SelectMutualVersion(
-    const ParsedQuicVersionVector& available_versions) {
-  // Try to find the highest mutual version by iterating over supported
-  // versions, starting with the highest, and breaking out of the loop once we
-  // find a matching version in the provided available_versions vector.
-  const ParsedQuicVersionVector& supported_versions =
-      framer_.supported_versions();
-  for (size_t i = 0; i < supported_versions.size(); ++i) {
-    const ParsedQuicVersion& version = supported_versions[i];
-    if (std::find(available_versions.begin(), available_versions.end(),
-                  version) != available_versions.end()) {
-      framer_.set_version(version);
-      return true;
-    }
-  }
-
-  return false;
-}
-
 void QuicConnection::OnError(QuicFramer* framer) {
   // Packets that we can not or have not decrypted are dropped.
   // TODO(rch): add stats to measure this.

quiche/quic/core/quic_connection.h

diff --git a/quiche/quic/core/quic_connection.h b/quiche/quic/core/quic_connection.h
index 29cc1c5..c70ce1c 100644
--- a/quiche/quic/core/quic_connection.h
+++ b/quiche/quic/core/quic_connection.h
@@ -1525,11 +1525,6 @@
   //      change.
   virtual QuicSocketAddress GetEffectivePeerAddressFromCurrentPacket() const;
 
-  // Selects and updates the version of the protocol being used by selecting a
-  // version from |available_versions| which is also supported. Returns true if
-  // such a version exists, false otherwise.
-  bool SelectMutualVersion(const ParsedQuicVersionVector& available_versions);
-
   // Returns the current per-packet options for the connection.
   PerPacketOptions* per_packet_options() { return per_packet_options_; }
 

quiche/quic/core/quic_connection_test.cc

diff --git a/quiche/quic/core/quic_connection_test.cc b/quiche/quic/core/quic_connection_test.cc
index 38a6389..c28a3c7 100644
--- a/quiche/quic/core/quic_connection_test.cc
+++ b/quiche/quic/core/quic_connection_test.cc
@@ -532,7 +532,6 @@
 
   using QuicConnection::active_effective_peer_migration_type;
   using QuicConnection::IsCurrentPacketConnectivityProbing;
-  using QuicConnection::SelectMutualVersion;
   using QuicConnection::set_defer_send_in_response_to_packets;
 
  protected:
@@ -7049,32 +7048,6 @@
               IsError(QUIC_PEER_GOING_AWAY));
 }
 
-TEST_P(QuicConnectionTest, SelectMutualVersion) {
-  connection_.SetSupportedVersions(AllSupportedVersions());
-  // Set the connection to speak the lowest quic version.
-  connection_.set_version(QuicVersionMin());
-  EXPECT_EQ(QuicVersionMin(), connection_.version());
-
-  // Pass in available versions which includes a higher mutually supported
-  // version.  The higher mutually supported version should be selected.
-  ParsedQuicVersionVector supported_versions = AllSupportedVersions();
-  EXPECT_TRUE(connection_.SelectMutualVersion(supported_versions));
-  EXPECT_EQ(QuicVersionMax(), connection_.version());
-
-  // Expect that the lowest version is selected.
-  // Ensure the lowest supported version is less than the max, unless they're
-  // the same.
-  ParsedQuicVersionVector lowest_version_vector;
-  lowest_version_vector.push_back(QuicVersionMin());
-  EXPECT_TRUE(connection_.SelectMutualVersion(lowest_version_vector));
-  EXPECT_EQ(QuicVersionMin(), connection_.version());
-
-  // Shouldn't be able to find a mutually supported version.
-  ParsedQuicVersionVector unsupported_version;
-  unsupported_version.push_back(UnsupportedQuicVersion());
-  EXPECT_FALSE(connection_.SelectMutualVersion(unsupported_version));
-}
-
 TEST_P(QuicConnectionTest, ConnectionCloseWhenWritable) {
   EXPECT_FALSE(writer_->IsWriteBlocked());