Standardize usage of virtual/override/final specifiers.

chrome/browser/process_singleton_browsertest.cc

Index: chrome/browser/process_singleton_browsertest.cc
diff --git a/chrome/browser/process_singleton_browsertest.cc b/chrome/browser/process_singleton_browsertest.cc
index 4a682a239a88d29cac923a371a47f814b76e6440..16262f75833a0a07e0fb114a5c64ed35fb8bfb0a 100644
--- a/chrome/browser/process_singleton_browsertest.cc
+++ b/chrome/browser/process_singleton_browsertest.cc
@@ -139,7 +139,7 @@ class ProcessSingletonTest : public InProcessBrowserTest {
     EXPECT_TRUE(temp_profile_dir_.CreateUniqueTempDir());
   }
 
-  virtual void SetUp() {
+  void SetUp() override {
     // Start the threads and create the starters.
     for (size_t i = 0; i < kNbThreads; ++i) {
       chrome_starter_threads_[i].reset(new base::Thread("ChromeStarter"));
@@ -149,7 +149,7 @@ class ProcessSingletonTest : public InProcessBrowserTest {
     }
   }
 
-  virtual void TearDown() {
+  void TearDown() override {
     // Stop the threads.
     for (size_t i = 0; i < kNbThreads; ++i)
       chrome_starter_threads_[i]->Stop();
@@ -169,7 +169,7 @@ class ProcessSingletonTest : public InProcessBrowserTest {
       explicit ProcessTreeFilter(base::ProcessId parent_pid) {
         ancestor_pids_.insert(parent_pid);
       }
-      virtual bool Includes(const base::ProcessEntry & entry) const override {
+      bool Includes(const base::ProcessEntry& entry) const override {
         if (ancestor_pids_.find(entry.parent_pid()) != ancestor_pids_.end()) {
           ancestor_pids_.insert(entry.pid());
           return true;