Update from https://crrev.com/327068

base/win/object_watcher_unittest.cc

Index: base/win/object_watcher_unittest.cc
diff --git a/base/win/object_watcher_unittest.cc b/base/win/object_watcher_unittest.cc
index 1a5e9e2a1a73e124e983c851b8b6cce5ea82dd82..b30ca41a4fe4d3f6cb37455a72ed57ed69d063e4 100644
--- a/base/win/object_watcher_unittest.cc
+++ b/base/win/object_watcher_unittest.cc
@@ -17,7 +17,7 @@ namespace {
 
 class QuitDelegate : public ObjectWatcher::Delegate {
  public:
-  virtual void OnObjectSignaled(HANDLE object) {
+  void OnObjectSignaled(HANDLE object) override {
     MessageLoop::current()->QuitWhenIdle();
   }
 };
@@ -26,9 +26,8 @@ class DecrementCountDelegate : public ObjectWatcher::Delegate {
  public:
   explicit DecrementCountDelegate(int* counter) : counter_(counter) {
   }
-  virtual void OnObjectSignaled(HANDLE object) {
-    --(*counter_);
-  }
+  void OnObjectSignaled(HANDLE object) override { --(*counter_); }
+
  private:
   int* counter_;
 };