replace 'virtual ... OVERRIDE' with '... override'

base/test/launcher/test_launcher.cc

 // Copyright 2013 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.
 
 #include "base/test/launcher/test_launcher.h"
 
 #if defined(OS_POSIX)
 #include <fcntl.h>
 #endif
 
@@ skipping 124 matching lines @@
   fflush(stdout);
 }
 
 // I/O watcher for the reading end of the self-pipe above.
 // Terminates any launched child processes and exits the process.
 class SignalFDWatcher : public MessageLoopForIO::Watcher {
  public:
   SignalFDWatcher() {
   }
 
-  virtual void OnFileCanReadWithoutBlocking(int fd) OVERRIDE {
+  void OnFileCanReadWithoutBlocking(int fd) override {
     fprintf(stdout, "\nCaught signal. Killing spawned test processes...\n");
     fflush(stdout);
 
     KillSpawnedTestProcesses();
 
     // The signal would normally kill the process, so exit now.
     exit(1);
   }
 
-  virtual void OnFileCanWriteWithoutBlocking(int fd) OVERRIDE {
-    NOTREACHED();
-  }
+  void OnFileCanWriteWithoutBlocking(int fd) override { NOTREACHED(); }
 
  private:
   DISALLOW_COPY_AND_ASSIGN(SignalFDWatcher);
 };
 #endif  // defined(OS_POSIX)
 
 // Parses the environment variable var as an Int32.  If it is unset, returns
 // true.  If it is set, unsets it then converts it to Int32 before
 // returning it in |result|.  Returns true on success.
 bool TakeInt32FromEnvironment(const char* const var, int32* result) {
@@ skipping 922 matching lines @@
   }
 
   std::string snippet(full_output.substr(run_pos));
   if (end_pos != std::string::npos)
     snippet = full_output.substr(run_pos, end_pos - run_pos);
 
   return snippet;
 }
 
 }  // namespace base