Standardize usage of virtual/override/final in mojo/

mojo/shell/child_process_host_unittest.cc

Index: mojo/shell/child_process_host_unittest.cc
diff --git a/mojo/shell/child_process_host_unittest.cc b/mojo/shell/child_process_host_unittest.cc
index 52230189ab574235d7556651b50f4bf6ddb359fe..2cd24dbc56606accdb2e10cd45e351c8b77ff61b 100644
--- a/mojo/shell/child_process_host_unittest.cc
+++ b/mojo/shell/child_process_host_unittest.cc
@@ -22,10 +22,10 @@ class TestChildProcessHostDelegate : public ChildProcessHost::Delegate {
  public:
   TestChildProcessHostDelegate() {}
   virtual ~TestChildProcessHostDelegate() {}
-  virtual void WillStart() override {
+  void WillStart() override {
     VLOG(2) << "TestChildProcessHostDelegate::WillStart()";
   }
-  virtual void DidStart(bool success) override {
+  void DidStart(bool success) override {
     VLOG(2) << "TestChildProcessHostDelegate::DidStart(" << success << ")";
     base::MessageLoop::current()->QuitWhenIdle();
   }