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

chrome/installer/setup/archive_patch_helper_unittest.cc

Index: chrome/installer/setup/archive_patch_helper_unittest.cc
diff --git a/chrome/installer/setup/archive_patch_helper_unittest.cc b/chrome/installer/setup/archive_patch_helper_unittest.cc
index 099dd174ac707aa6f23205d1cb7e78a3f968eff1..f42ed5baffa6a9d214ec9f50732ec33f76d4496b 100644
--- a/chrome/installer/setup/archive_patch_helper_unittest.cc
+++ b/chrome/installer/setup/archive_patch_helper_unittest.cc
@@ -24,12 +24,12 @@ class ArchivePatchHelperTest : public testing::Test {
     data_dir_.clear();
   }
 
-  virtual void SetUp() override {
+  void SetUp() override {
     // Create a temp directory for testing.
     ASSERT_TRUE(test_dir_.CreateUniqueTempDir());
   }
 
-  virtual void TearDown() override {
+  void TearDown() override {
     // Clean up test directory manually so we can fail if it leaks.
     ASSERT_TRUE(test_dir_.Delete());
   }