Standardize usage of virtual/override/final specifiers.

components/nacl/loader/nonsfi/nonsfi_main.cc

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "components/nacl/loader/nonsfi/nonsfi_main.h"
 
 #include "base/logging.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/threading/platform_thread.h"
 #include "base/threading/thread_restrictions.h"
@@ skipping 10 matching lines @@
 namespace {
 
 typedef void (*EntryPointType)(uintptr_t*);
 
 class PluginMainDelegate : public base::PlatformThread::Delegate {
  public:
   explicit PluginMainDelegate(EntryPointType entry_point)
       : entry_point_(entry_point) {
   }
 
-  virtual ~PluginMainDelegate() {
-  }
+  ~PluginMainDelegate() override {}
 
-  virtual void ThreadMain() override {
+  void ThreadMain() override {
     base::PlatformThread::SetName("NaClMainThread");
 
     // This will only happen once per process, so we give the permission to
     // create Singletons.
     base::ThreadRestrictions::SetSingletonAllowed(true);
     uintptr_t info[] = {
       0,  // Do not use fini.
       0,  // envc.
       0,  // argc.
       0,  // Null terminate for argv.
@@ skipping 39 matching lines @@
       reinterpret_cast<EntryPointType>(image.entry_point());
   if (!base::PlatformThread::CreateNonJoinable(
           kStackSize, new PluginMainDelegate(entry_point))) {
     LOG(ERROR) << "LoadModuleRpc: Failed to create plugin main thread.";
     return;
   }
 }
 
 }  // namespace nonsfi
 }  // namespace nacl