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

remoting/host/ipc_desktop_environment_unittest.cc

Index: remoting/host/ipc_desktop_environment_unittest.cc
diff --git a/remoting/host/ipc_desktop_environment_unittest.cc b/remoting/host/ipc_desktop_environment_unittest.cc
index d31d3d46acd51160f2aae5e3b6084cd03b66e202..186574bd4afd24c58dfeb645725b1d7517c5c22e 100644
--- a/remoting/host/ipc_desktop_environment_unittest.cc
+++ b/remoting/host/ipc_desktop_environment_unittest.cc
@@ -57,10 +57,10 @@ namespace {
 class FakeDaemonSender : public IPC::Sender {
  public:
   FakeDaemonSender() {}
-  virtual ~FakeDaemonSender() {}
+  ~FakeDaemonSender() override {}
 
   // IPC::Sender implementation.
-  virtual bool Send(IPC::Message* message) override;
+  bool Send(IPC::Message* message) override;
 
   MOCK_METHOD3(ConnectTerminal, void(int, const ScreenResolution&, bool));
   MOCK_METHOD1(DisconnectTerminal, void(int));
@@ -76,9 +76,9 @@ class FakeDaemonSender : public IPC::Sender {
 class MockDaemonListener : public IPC::Listener {
  public:
   MockDaemonListener() {}
-  virtual ~MockDaemonListener() {}
+  ~MockDaemonListener() override {}
 
-  virtual bool OnMessageReceived(const IPC::Message& message) override;
+  bool OnMessageReceived(const IPC::Message& message) override;
 
   MOCK_METHOD1(OnDesktopAttached, void(IPC::PlatformFileForTransit));
   MOCK_METHOD1(OnChannelConnected, void(int32));