Update {virtual,override} to follow C++11 style in chrome.

chrome/browser/sync/glue/sync_backend_host_impl_unittest.cc

Index: chrome/browser/sync/glue/sync_backend_host_impl_unittest.cc
diff --git a/chrome/browser/sync/glue/sync_backend_host_impl_unittest.cc b/chrome/browser/sync/glue/sync_backend_host_impl_unittest.cc
index bbc5a4dcf3b9cb403cf7b02fa3a332df04b62765..7301b1dfd3c1cf8abd3e3ac44565a1e7a3948a4e 100644
--- a/chrome/browser/sync/glue/sync_backend_host_impl_unittest.cc
+++ b/chrome/browser/sync/glue/sync_backend_host_impl_unittest.cc
@@ -151,9 +151,9 @@ class SyncBackendHostTest : public testing::Test {
         profile_manager_(TestingBrowserProcess::GetGlobal()),
         fake_manager_(NULL) {}
 
-  virtual ~SyncBackendHostTest() {}
+  ~SyncBackendHostTest() override {}
 
-  virtual void SetUp() override {
+  void SetUp() override {
     ASSERT_TRUE(profile_manager_.SetUp());
     profile_ = profile_manager_.CreateTestingProfile(kTestProfileName);
     sync_prefs_.reset(new sync_driver::SyncPrefs(profile_->GetPrefs()));
@@ -184,7 +184,7 @@ class SyncBackendHostTest : public testing::Test {
     network_resources_.reset(new syncer::HttpBridgeNetworkResources());
   }
 
-  virtual void TearDown() override {
+  void TearDown() override {
     if (backend_) {
       backend_->StopSyncingForShutdown();
       backend_->Shutdown(syncer::STOP_SYNC);