Update {virtual,override,final} to follow C++11 style in chrome/browser/chromeos/drive.

chrome/browser/chromeos/drive/fake_file_system_unittest.cc

Index: chrome/browser/chromeos/drive/fake_file_system_unittest.cc
diff --git a/chrome/browser/chromeos/drive/fake_file_system_unittest.cc b/chrome/browser/chromeos/drive/fake_file_system_unittest.cc
index 5e5a1ef853f6fbb4eb30eb6f6c78574e2fceca6d..e7f67b0813dd700b984f9b15e3fd27a61225e22a 100644
--- a/chrome/browser/chromeos/drive/fake_file_system_unittest.cc
+++ b/chrome/browser/chromeos/drive/fake_file_system_unittest.cc
@@ -18,7 +18,7 @@ namespace test_util {
 
 class FakeFileSystemTest : public ::testing::Test {
  protected:
-  virtual void SetUp() override {
+  void SetUp() override {
     // Initialize FakeDriveService.
     fake_drive_service_.reset(new FakeDriveService);
     ASSERT_TRUE(SetUpTestEntries(fake_drive_service_.get()));