Standardize usage of virtual/override/final in chrome/browser/

chrome/browser/process_singleton_posix.cc

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 // On Linux, when the user tries to launch a second copy of chrome, we check
 // for a socket in the user's profile directory.  If the socket file is open we
 // send a message to the first chrome browser process with the current
 // directory and second process command line flags.  The second process then
 // exits.
 //
@@ skipping 468 matching lines @@
           bytes_read_(0) {
       DCHECK(BrowserThread::CurrentlyOn(BrowserThread::IO));
       // Wait for reads.
       base::MessageLoopForIO::current()->WatchFileDescriptor(
           fd, true, base::MessageLoopForIO::WATCH_READ, &fd_reader_, this);
       // If we haven't completed in a reasonable amount of time, give up.
       timer_.Start(FROM_HERE, base::TimeDelta::FromSeconds(kTimeoutInSeconds),
                    this, &SocketReader::CleanupAndDeleteSelf);
     }
 
-    virtual ~SocketReader() {
-      CloseSocket(fd_);
-    }
+    ~SocketReader() override { CloseSocket(fd_); }
 
     // MessageLoopForIO::Watcher impl.
-    virtual void OnFileCanReadWithoutBlocking(int fd) override;
-    virtual void OnFileCanWriteWithoutBlocking(int fd) override {
+    void OnFileCanReadWithoutBlocking(int fd) override;
+    void OnFileCanWriteWithoutBlocking(int fd) override {
       // SocketReader only watches for accept (read) events.
       NOTREACHED();
     }
 
     // Finish handling the incoming message by optionally sending back an ACK
     // message and removing this SocketReader.
     void FinishWithACK(const char *message, size_t length);
 
    private:
     void CleanupAndDeleteSelf() {
@@ skipping 37 matching lines @@
   void StartListening(int socket);
 
   // This method determines if we should use the same process and if we should,
   // opens a new browser tab.  This runs on the UI thread.
   // |reader| is for sending back ACK message.
   void HandleMessage(const std::string& current_dir,
                      const std::vector<std::string>& argv,
                      SocketReader* reader);
 
   // MessageLoopForIO::Watcher impl.  These run on the IO thread.
-  virtual void OnFileCanReadWithoutBlocking(int fd) override;
-  virtual void OnFileCanWriteWithoutBlocking(int fd) override {
+  void OnFileCanReadWithoutBlocking(int fd) override;
+  void OnFileCanWriteWithoutBlocking(int fd) override {
     // ProcessSingleton only watches for accept (read) events.
     NOTREACHED();
   }
 
   // MessageLoop::DestructionObserver
-  virtual void WillDestroyCurrentMessageLoop() override {
+  void WillDestroyCurrentMessageLoop() override {
     fd_watcher_.StopWatchingFileDescriptor();
   }
 
  private:
   friend struct BrowserThread::DeleteOnThread<BrowserThread::IO>;
   friend class base::DeleteHelper<ProcessSingleton::LinuxWatcher>;
 
-  virtual ~LinuxWatcher() {
+  ~LinuxWatcher() override {
     DCHECK(BrowserThread::CurrentlyOn(BrowserThread::IO));
     STLDeleteElements(&readers_);
 
     base::MessageLoopForIO* ml = base::MessageLoopForIO::current();
     ml->RemoveDestructionObserver(this);
   }
 
   // Removes and deletes the SocketReader.
   void RemoveSocketReader(SocketReader* reader);
 
@@ skipping 490 matching lines @@
 }
 
 void ProcessSingleton::KillProcess(int pid) {
   // TODO(james.su@gmail.com): Is SIGKILL ok?
   int rv = kill(static_cast<base::ProcessHandle>(pid), SIGKILL);
   // ESRCH = No Such Process (can happen if the other process is already in
   // progress of shutting down and finishes before we try to kill it).
   DCHECK(rv == 0 || errno == ESRCH) << "Error killing process: "
                                     << safe_strerror(errno);
 }