Standardize usage of virtual/override/final specifiers.

chrome/browser/process_singleton_posix_unittest.cc

Index: chrome/browser/process_singleton_posix_unittest.cc
diff --git a/chrome/browser/process_singleton_posix_unittest.cc b/chrome/browser/process_singleton_posix_unittest.cc
index 9153c1f0e0f11d9b17818d6887cad52743cf8a65..f12e3ff448fe52db414dc36d4266f9548a15bc7b 100644
--- a/chrome/browser/process_singleton_posix_unittest.cc
+++ b/chrome/browser/process_singleton_posix_unittest.cc
@@ -71,7 +71,7 @@ class ProcessSingletonPosixTest : public testing::Test {
     io_thread_.StartIOThread();
   }
 
-  virtual void SetUp() {
+  void SetUp() override {
     testing::Test::SetUp();
 
     ProcessSingleton::DisablePromptForTesting();
@@ -89,7 +89,7 @@ class ProcessSingletonPosixTest : public testing::Test {
     cookie_path_ = user_data_path_.Append(chrome::kSingletonCookieFilename);
   }
 
-  virtual void TearDown() {
+  void TearDown() override {
     scoped_refptr<base::ThreadTestHelper> io_helper(new base::ThreadTestHelper(
         BrowserThread::GetMessageLoopProxyForThread(BrowserThread::IO).get()));
     ASSERT_TRUE(io_helper->Run());