Standardize usage of virtual/override/final specifiers.

extensions/shell/test/shell_test_launcher_delegate.h

Index: extensions/shell/test/shell_test_launcher_delegate.h
diff --git a/extensions/shell/test/shell_test_launcher_delegate.h b/extensions/shell/test/shell_test_launcher_delegate.h
index c6fbfdfcb11f49a71db2fe0899b80f98979b0cae..58976db04eda28af189d342c19bbbce4ed17c2c3 100644
--- a/extensions/shell/test/shell_test_launcher_delegate.h
+++ b/extensions/shell/test/shell_test_launcher_delegate.h
@@ -11,11 +11,11 @@ namespace extensions {
 
 class AppShellTestLauncherDelegate : public content::TestLauncherDelegate {
  public:
-  virtual int RunTestSuite(int argc, char** argv) override;
-  virtual bool AdjustChildProcessCommandLine(
+  int RunTestSuite(int argc, char** argv) override;
+  bool AdjustChildProcessCommandLine(
       base::CommandLine* command_line,
       const base::FilePath& temp_data_dir) override;
-  virtual content::ContentMainDelegate* CreateContentMainDelegate() override;
+  content::ContentMainDelegate* CreateContentMainDelegate() override;
 };
 
 }  // namespace extensions