Standardize usage of virtual/override/final specifiers in components/.

components/domain_reliability/util.h

Index: components/domain_reliability/util.h
diff --git a/components/domain_reliability/util.h b/components/domain_reliability/util.h
index fae5a4061450cc09b3e06e46197b8ce0ff12596a..4256b059cbd0a4e41d76051b3c02f072ca67622a 100644
--- a/components/domain_reliability/util.h
+++ b/components/domain_reliability/util.h
@@ -104,10 +104,10 @@ class MockableTimeBackoffEntry : public net::BackoffEntry {
   MockableTimeBackoffEntry(const net::BackoffEntry::Policy* const policy,
                            MockableTime* time);
 
-  virtual ~MockableTimeBackoffEntry();
+  ~MockableTimeBackoffEntry() override;
 
  protected:
-  virtual base::TimeTicks ImplGetTimeNow() const override;
+  base::TimeTicks ImplGetTimeNow() const override;
 
  private:
   MockableTime* time_;