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

base/files/file_path_watcher_mac.cc

Index: base/files/file_path_watcher_mac.cc
diff --git a/base/files/file_path_watcher_mac.cc b/base/files/file_path_watcher_mac.cc
index b21ba1d65bba12538016fe6c5d35fa8db6131335..2c008395c780e3f2a17217e081681905c17c672d 100644
--- a/base/files/file_path_watcher_mac.cc
+++ b/base/files/file_path_watcher_mac.cc
@@ -15,9 +15,9 @@ namespace {
 
 class FilePathWatcherImpl : public FilePathWatcher::PlatformDelegate {
  public:
-  virtual bool Watch(const FilePath& path,
-                     bool recursive,
-                     const FilePathWatcher::Callback& callback) OVERRIDE {
+  bool Watch(const FilePath& path,
+             bool recursive,
+             const FilePathWatcher::Callback& callback) override {
     // Use kqueue for non-recursive watches and FSEvents for recursive ones.
     DCHECK(!impl_.get());
     if (recursive) {
@@ -33,13 +33,13 @@ class FilePathWatcherImpl : public FilePathWatcher::PlatformDelegate {
     return impl_->Watch(path, recursive, callback);
   }
 
-  virtual void Cancel() OVERRIDE {
+  void Cancel() override {
     if (impl_.get())
       impl_->Cancel();
     set_cancelled();
   }
 
-  virtual void CancelOnMessageLoopThread() OVERRIDE {
+  void CancelOnMessageLoopThread() override {
     if (impl_.get())
       impl_->Cancel();
     set_cancelled();