mac: Remove IsOSLion().

remoting/host/curtain_mode_mac.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 "remoting/host/curtain_mode.h"
 
 #include <ApplicationServices/ApplicationServices.h>
 #include <Carbon/Carbon.h>
 #include <Security/Security.h>
 #include <unistd.h>
@@ skipping 97 matching lines @@
   client_session_control_.reset();
   ui_task_runner_->PostTask(
       FROM_HERE, base::Bind(&SessionWatcher::RemoveEventHandler, this));
 }
 
 SessionWatcher::~SessionWatcher() {
   DCHECK(!event_handler_);
 }
 
 void SessionWatcher::ActivateCurtain() {
-  // Curtain mode causes problems with the login screen on Lion only (starting
-  // with 10.7.3), so disable it on that platform. There is a work-around, but
-  // it involves modifying a system Plist pertaining to power-management, so
-  // it's not something that should be done automatically. For more details,
-  // see https://discussions.apple.com/thread/3209415?start=690&tstart=0
-  //
-  // TODO(jamiewalch): If the underlying OS bug is ever fixed, we should support
-  // curtain mode on suitable versions of Lion.
-  if (base::mac::IsOSLion()) {
-    LOG(ERROR) << "Host curtaining is not supported on Mac OS X 10.7.";
-    DisconnectSession(protocol::ErrorCode::HOST_CONFIGURATION_ERROR);
-    return;
-  }
-
   // Try to install the switch-in handler. Do this before switching out the
   // current session so that the console session is not affected if it fails.
   if (!InstallEventHandler()) {
     LOG(ERROR) << "Failed to install the switch-in handler.";
     DisconnectSession(protocol::ErrorCode::HOST_CONFIGURATION_ERROR);
     return;
   }
 
   base::ScopedCFTypeRef<CFDictionaryRef> session(
       CGSessionCopyCurrentDictionary());
@@ skipping 121 matching lines @@
 // static
 std::unique_ptr<CurtainMode> CurtainMode::Create(
     scoped_refptr<base::SingleThreadTaskRunner> caller_task_runner,
     scoped_refptr<base::SingleThreadTaskRunner> ui_task_runner,
     base::WeakPtr<ClientSessionControl> client_session_control) {
   return base::WrapUnique(new CurtainModeMac(caller_task_runner, ui_task_runner,
                                              client_session_control));
 }
 
 }  // namespace remoting