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

net/http/transport_security_persister_unittest.cc

Index: net/http/transport_security_persister_unittest.cc
diff --git a/net/http/transport_security_persister_unittest.cc b/net/http/transport_security_persister_unittest.cc
index b8dad5a54863e33df3dcc946af8d748f7e6aaa7f..7bb2e99583380b0244702a4ce43a2dd0c079d6e8 100644
--- a/net/http/transport_security_persister_unittest.cc
+++ b/net/http/transport_security_persister_unittest.cc
@@ -23,11 +23,11 @@ class TransportSecurityPersisterTest : public testing::Test {
   TransportSecurityPersisterTest() {
   }
 
-  virtual ~TransportSecurityPersisterTest() {
+  ~TransportSecurityPersisterTest() override {
     base::MessageLoopForIO::current()->RunUntilIdle();
   }
 
-  virtual void SetUp() override {
+  void SetUp() override {
     ASSERT_TRUE(temp_dir_.CreateUniqueTempDir());
     persister_.reset(new TransportSecurityPersister(
         &state_,