Update {virtual,override} to follow C++11 style in ppapi.

ppapi/proxy/device_enumeration_resource_helper_unittest.cc

 // Copyright (c) 2012 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 "base/basictypes.h"
 #include "base/compiler_specific.h"
 #include "ppapi/c/pp_errors.h"
 #include "ppapi/proxy/connection.h"
 #include "ppapi/proxy/device_enumeration_resource_helper.h"
 #include "ppapi/proxy/plugin_message_filter.h"
@@ skipping 53 matching lines @@
   return result;
 }
 
 class TestResource : public PluginResource {
  public:
   TestResource(Connection connection, PP_Instance instance)
       : PluginResource(connection, instance),
         device_enumeration_(this) {
   }
 
-  virtual ~TestResource() {}
+  ~TestResource() override {}
 
-  virtual void OnReplyReceived(const ResourceMessageReplyParams& params,
-                               const IPC::Message& msg) override {
+  void OnReplyReceived(const ResourceMessageReplyParams& params,
+                       const IPC::Message& msg) override {
     if (!device_enumeration_.HandleReply(params, msg))
       PluginResource::OnReplyReceived(params, msg);
   }
 
   DeviceEnumerationResourceHelper& device_enumeration() {
     return device_enumeration_;
   }
 
  private:
   DeviceEnumerationResourceHelper device_enumeration_;
@@ skipping 307 matching lines @@
     PluginMessageFilter::DispatchResourceReplyForTest(
         reply_params,
         PpapiPluginMsg_DeviceEnumeration_NotifyDeviceChange(
             callback_id2, data));
   }
   EXPECT_FALSE(helper2.called());
 }
 
 }  // namespace proxy
 }  // namespace ppapi