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

chrome/browser/sync_file_system/sync_file_system_service_unittest.cc

Index: chrome/browser/sync_file_system/sync_file_system_service_unittest.cc
diff --git a/chrome/browser/sync_file_system/sync_file_system_service_unittest.cc b/chrome/browser/sync_file_system/sync_file_system_service_unittest.cc
index 9f794cdc2feee02bc5fcf34ff5bdb27a5cb1c7fe..ddf32d0d5894ba705fa64f8afb224004a38ea52a 100644
--- a/chrome/browser/sync_file_system/sync_file_system_service_unittest.cc
+++ b/chrome/browser/sync_file_system/sync_file_system_service_unittest.cc
@@ -131,7 +131,7 @@ class SyncFileSystemServiceTest : public testing::Test {
       : thread_bundle_(content::TestBrowserThreadBundle::REAL_FILE_THREAD |
                        content::TestBrowserThreadBundle::REAL_IO_THREAD) {}
 
-  virtual void SetUp() override {
+  void SetUp() override {
     in_memory_env_.reset(leveldb::NewMemEnv(leveldb::Env::Default()));
     file_system_.reset(new CannedSyncableFileSystem(
         GURL(kOrigin),
@@ -165,7 +165,7 @@ class SyncFileSystemServiceTest : public testing::Test {
     file_system_->SetUp(CannedSyncableFileSystem::QUOTA_ENABLED);
   }
 
-  virtual void TearDown() override {
+  void TearDown() override {
     sync_service_->Shutdown();
     file_system_->TearDown();
     RevokeSyncableFileSystem();