Standardize usage of virtual/override/final in net/

net/url_request/url_request_throttler_unittest.cc

Index: net/url_request/url_request_throttler_unittest.cc
diff --git a/net/url_request/url_request_throttler_unittest.cc b/net/url_request/url_request_throttler_unittest.cc
index 4188b77cf0985c4900051ac9898595389213f51e..5a309b928c099946365406164497dc931a1543e1 100644
--- a/net/url_request/url_request_throttler_unittest.cc
+++ b/net/url_request/url_request_throttler_unittest.cc
@@ -63,13 +63,11 @@ class MockURLRequestThrottlerEntry : public URLRequestThrottlerEntry {
     backoff_policy_.num_errors_to_ignore = 0;
   }
 
-  virtual const BackoffEntry* GetBackoffEntry() const override {
+  const BackoffEntry* GetBackoffEntry() const override {
     return &mock_backoff_entry_;
   }
 
-  virtual BackoffEntry* GetBackoffEntry() override {
-    return &mock_backoff_entry_;
-  }
+  BackoffEntry* GetBackoffEntry() override { return &mock_backoff_entry_; }
 
   static bool ExplicitUserRequest(int load_flags) {
     return URLRequestThrottlerEntry::ExplicitUserRequest(load_flags);
@@ -85,7 +83,7 @@ class MockURLRequestThrottlerEntry : public URLRequestThrottlerEntry {
   }
 
   // Overridden for tests.
-  virtual TimeTicks ImplGetTimeNow() const override { return fake_time_now_; }
+  TimeTicks ImplGetTimeNow() const override { return fake_time_now_; }
 
   void set_exponential_backoff_release_time(
       const base::TimeTicks& release_time) {
@@ -106,7 +104,7 @@ class MockURLRequestThrottlerEntry : public URLRequestThrottlerEntry {
   MockBackoffEntry mock_backoff_entry_;
 
  protected:
-  virtual ~MockURLRequestThrottlerEntry() {}
+  ~MockURLRequestThrottlerEntry() override {}
 };
 
 class MockURLRequestThrottlerManager : public URLRequestThrottlerManager {