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

content/renderer/media/video_capture_message_filter_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/memory/shared_memory.h"
 #include "content/common/media/video_capture_messages.h"
 #include "content/renderer/media/video_capture_message_filter.h"
 #include "ipc/ipc_test_sink.h"
 #include "media/base/video_capture_types.h"
 #include "testing/gmock/include/gmock/gmock.h"
@@ skipping 32 matching lines @@
                     const gpu::MailboxHolder& mailbox_holder,
                     const gfx::Size& packed_frame_size,
                     base::TimeTicks timestamp,
                     const base::DictionaryValue& metadata));
   MOCK_METHOD1(OnStateChanged, void(VideoCaptureState state));
   MOCK_METHOD1(OnDeviceSupportedFormatsEnumerated,
                void(const media::VideoCaptureFormats& formats));
   MOCK_METHOD1(OnDeviceFormatsInUseReceived,
                void(const media::VideoCaptureFormats& formats_in_use));
 
-  virtual void OnDelegateAdded(int32 device_id) override {
+  void OnDelegateAdded(int32 device_id) override {
     ASSERT_TRUE(device_id != 0);
     ASSERT_TRUE(device_id_ == 0);
     device_id_ = device_id;
   }
 
   int device_id() { return device_id_; }
 
  private:
   int device_id_;
 };
@@ skipping 157 matching lines @@
   MockVideoCaptureDelegate delegate;
   filter->AddDelegate(&delegate);
   ASSERT_EQ(1, delegate.device_id());
 
   EXPECT_CALL(delegate, OnDeviceFormatsInUseReceived(_));
   media::VideoCaptureFormats formats_in_use;
   filter->OnMessageReceived(VideoCaptureMsg_DeviceFormatsInUseReceived(
       delegate.device_id(), formats_in_use));
 }
 }  // namespace content