Standardize usage of virtual/override/final specifiers.

components/navigation_interception/intercept_navigation_resource_throttle_unittest.cc

Index: components/navigation_interception/intercept_navigation_resource_throttle_unittest.cc
diff --git a/components/navigation_interception/intercept_navigation_resource_throttle_unittest.cc b/components/navigation_interception/intercept_navigation_resource_throttle_unittest.cc
index a55cda34bbc2c627f3b4c86badc77d227d0cbf82..801efe4e8bfadc35957d83545f4d4f42655ed75f 100644
--- a/components/navigation_interception/intercept_navigation_resource_throttle_unittest.cc
+++ b/components/navigation_interception/intercept_navigation_resource_throttle_unittest.cc
@@ -184,11 +184,9 @@ class InterceptNavigationResourceThrottleTest
         io_thread_state_(NULL) {
   }
 
-  virtual void SetUp() override {
-    RenderViewHostTestHarness::SetUp();
-  }
+  void SetUp() override { RenderViewHostTestHarness::SetUp(); }
 
-  virtual void TearDown() override {
+  void TearDown() override {
     if (web_contents())
       web_contents()->SetDelegate(NULL);