Standardize usage of virtual/override/final in sync/

sync/internal_api/http_bridge_unittest.cc

Index: sync/internal_api/http_bridge_unittest.cc
diff --git a/sync/internal_api/http_bridge_unittest.cc b/sync/internal_api/http_bridge_unittest.cc
index 7a2ec925cc32f03711a65fbbdb1efcc9cf5c5999..b03ddcd65f4541bbcf76f6c6fd82dcae6a20cfba 100644
--- a/sync/internal_api/http_bridge_unittest.cc
+++ b/sync/internal_api/http_bridge_unittest.cc
@@ -124,7 +124,7 @@ class ShuntedHttpBridge : public HttpBridge {
           NetworkTimeUpdateCallback()),
         test_(test), never_finishes_(never_finishes) { }
  protected:
-  virtual void MakeAsynchronousPost() override {
+  void MakeAsynchronousPost() override {
     ASSERT_TRUE(base::MessageLoop::current() == test_->GetIOThreadLoop());
     if (never_finishes_)
       return;
@@ -135,7 +135,7 @@ class ShuntedHttpBridge : public HttpBridge {
         base::Bind(&ShuntedHttpBridge::CallOnURLFetchComplete, this));
   }
  private:
-  virtual ~ShuntedHttpBridge() {}
+  ~ShuntedHttpBridge() override {}
 
   void CallOnURLFetchComplete() {
     ASSERT_TRUE(base::MessageLoop::current() == test_->GetIOThreadLoop());