Standardize usage of virtual/override/final in components/

components/nacl/browser/nacl_file_host_unittest.cc

Index: components/nacl/browser/nacl_file_host_unittest.cc
diff --git a/components/nacl/browser/nacl_file_host_unittest.cc b/components/nacl/browser/nacl_file_host_unittest.cc
index c3da2de900e76ea8feab83804cb6b755c8bce59a..292ac46b81c693be0f6264b1ced24c722b7b3f2c 100644
--- a/components/nacl/browser/nacl_file_host_unittest.cc
+++ b/components/nacl/browser/nacl_file_host_unittest.cc
@@ -19,7 +19,7 @@ class FileHostTestNaClBrowserDelegate : public TestNaClBrowserDelegate {
  public:
   FileHostTestNaClBrowserDelegate() {}
 
-  virtual bool GetPnaclDirectory(base::FilePath* pnacl_dir) override {
+  bool GetPnaclDirectory(base::FilePath* pnacl_dir) override {
     *pnacl_dir = pnacl_path_;
     return true;
   }