Standardize usage of virtual/override/final specifiers.

content/browser/service_worker/service_worker_dispatcher_host_unittest.cc

Index: content/browser/service_worker/service_worker_dispatcher_host_unittest.cc
diff --git a/content/browser/service_worker/service_worker_dispatcher_host_unittest.cc b/content/browser/service_worker/service_worker_dispatcher_host_unittest.cc
index 6f7f25d0e8081b7da901b0d23e139e2aef5fcac4..799acd3e7562a81be9cf46f4a3e9ad417dc07a37 100644
--- a/content/browser/service_worker/service_worker_dispatcher_host_unittest.cc
+++ b/content/browser/service_worker/service_worker_dispatcher_host_unittest.cc
@@ -56,15 +56,13 @@ class ServiceWorkerDispatcherHostTest : public testing::Test {
   ServiceWorkerDispatcherHostTest()
       : browser_thread_bundle_(TestBrowserThreadBundle::IO_MAINLOOP) {}
 
-  virtual void SetUp() {
+  void SetUp() override {
     helper_.reset(new EmbeddedWorkerTestHelper(kRenderProcessId));
     dispatcher_host_ = new TestingServiceWorkerDispatcherHost(
         kRenderProcessId, context_wrapper(), &resource_context_, helper_.get());
   }
 
-  virtual void TearDown() {
-    helper_.reset();
-  }
+  void TearDown() override { helper_.reset(); }
 
   ServiceWorkerContextCore* context() { return helper_->context(); }
   ServiceWorkerContextWrapper* context_wrapper() {