Update from chromium https://crrev.com/301725/

net/dns/dns_transaction_unittest.cc

Index: net/dns/dns_transaction_unittest.cc
diff --git a/net/dns/dns_transaction_unittest.cc b/net/dns/dns_transaction_unittest.cc
index 5581f22ed0f6fa5abcaec1ae5ebf480931ccb1fc..f22478c045024a2f5eade0a3efe8e0b603776e12 100644
--- a/net/dns/dns_transaction_unittest.cc
+++ b/net/dns/dns_transaction_unittest.cc
@@ -441,7 +441,7 @@ class DnsTransactionTest : public testing::Test {
     }
   }
 
-  virtual void SetUp() override {
+  void SetUp() override {
     // By default set one server,
     ConfigureNumServers(1);
     // and no retransmissions,
@@ -451,7 +451,7 @@ class DnsTransactionTest : public testing::Test {
     ConfigureFactory();
   }
 
-  virtual void TearDown() override {
+  void TearDown() override {
     // Check that all socket data was at least written to.
     for (size_t i = 0; i < socket_data_.size(); ++i) {
       EXPECT_TRUE(socket_data_[i]->was_written()) << i;