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

net/dns/serial_worker_unittest.cc

Index: net/dns/serial_worker_unittest.cc
diff --git a/net/dns/serial_worker_unittest.cc b/net/dns/serial_worker_unittest.cc
index 8e30e28cf6ffdf091ce44d2007a98b13ef06dd10..18b546450d12940bac41410535223c37419530e5 100644
--- a/net/dns/serial_worker_unittest.cc
+++ b/net/dns/serial_worker_unittest.cc
@@ -96,12 +96,12 @@ class SerialWorkerTest : public testing::Test {
   }
 
   // test::Test methods
-  virtual void SetUp() override {
+  void SetUp() override {
     message_loop_ = base::MessageLoop::current();
     worker_ = new TestSerialWorker(this);
   }
 
-  virtual void TearDown() override {
+  void TearDown() override {
     // Cancel the worker to catch if it makes a late DoWork call.
     worker_->Cancel();
     // Check if OnWork is stalled.