Remove unnecessary 'virtual' annotation from mojo

mojo/services/html_viewer/blink_platform_impl.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 "mojo/services/html_viewer/blink_platform_impl.h"
 
 #include <cmath>
 
 #include "base/command_line.h"
 #include "base/rand_util.h"
@@ skipping 16 matching lines @@
 const char kUserAgentSwitch[] = "user-agent";
 
 // TODO(darin): Figure out what our UA should really be.
 const char kDefaultUserAgentString[] =
     "Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) "
     "Chrome/35.0.1916.153 Safari/537.36";
 
 class WebWaitableEventImpl : public blink::WebWaitableEvent {
  public:
   WebWaitableEventImpl() : impl_(new base::WaitableEvent(false, false)) {}
-  virtual ~WebWaitableEventImpl() {}
+  ~WebWaitableEventImpl() override {}
 
-  virtual void wait() { impl_->Wait(); }
-  virtual void signal() { impl_->Signal(); }
+  void wait() override { impl_->Wait(); }
+  void signal() override { impl_->Signal(); }
 
   base::WaitableEvent* impl() {
     return impl_.get();
   }
 
  private:
   scoped_ptr<base::WaitableEvent> impl_;
   DISALLOW_COPY_AND_ASSIGN(WebWaitableEventImpl);
 };
 
@@ skipping 207 matching lines @@
 }
 
 // static
 void BlinkPlatformImpl::DestroyCurrentThread(void* thread) {
   WebThreadImplForMessageLoop* impl =
       static_cast<WebThreadImplForMessageLoop*>(thread);
   delete impl;
 }
 
 }  // namespace html_viewer