Standardize usage of virtual/override/final in content/browser/

content/browser/security_exploit_browsertest.cc

Index: content/browser/security_exploit_browsertest.cc
diff --git a/content/browser/security_exploit_browsertest.cc b/content/browser/security_exploit_browsertest.cc
index 21b3a568323849642c245460cb805aed18c67613..2a1be07b9a9a34189f0747fcc329d36c1bd19ec9 100644
--- a/content/browser/security_exploit_browsertest.cc
+++ b/content/browser/security_exploit_browsertest.cc
@@ -84,7 +84,7 @@ RenderViewHostImpl* PrepareToDuplicateHosts(Shell* shell,
 class SecurityExploitBrowserTest : public ContentBrowserTest {
  public:
   SecurityExploitBrowserTest() {}
-  virtual void SetUpCommandLine(CommandLine* command_line) override {
+  void SetUpCommandLine(CommandLine* command_line) override {
     ASSERT_TRUE(test_server()->Start());
 
     // Add a host resolver rule to map all outgoing requests to the test server.