Standardize usage of virtual/override/final specifiers.

chrome/browser/net/pref_proxy_config_tracker_impl_unittest.cc

Index: chrome/browser/net/pref_proxy_config_tracker_impl_unittest.cc
diff --git a/chrome/browser/net/pref_proxy_config_tracker_impl_unittest.cc b/chrome/browser/net/pref_proxy_config_tracker_impl_unittest.cc
index 93b132728acb25bf0bec420ce3f4501eabe530df..1cc1be6809ee51863d0003a8f473c1ae7c6bc6e0 100644
--- a/chrome/browser/net/pref_proxy_config_tracker_impl_unittest.cc
+++ b/chrome/browser/net/pref_proxy_config_tracker_impl_unittest.cc
@@ -115,7 +115,7 @@ class PrefProxyConfigTrackerImplTestBase : public TESTBASE {
 class PrefProxyConfigTrackerImplTest
     : public PrefProxyConfigTrackerImplTestBase<testing::Test> {
  protected:
-  virtual void SetUp() {
+  void SetUp() override {
     pref_service_.reset(new TestingPrefServiceSimple());
     Init(pref_service_.get(), pref_service_->registry());
   }
@@ -328,7 +328,7 @@ class PrefProxyConfigTrackerImplCommandLineTest
   PrefProxyConfigTrackerImplCommandLineTest()
       : command_line_(CommandLine::NO_PROGRAM) {}
 
-  virtual void SetUp() {
+  void SetUp() override {
     for (size_t i = 0; i < arraysize(GetParam().switches); i++) {
       const char* name = GetParam().switches[i].name;
       const char* value = GetParam().switches[i].value;