Enable win32k lockdown for ppapi processes.

content/browser/browser_main_loop.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 "content/browser/browser_main_loop.h"
 
 #include <stddef.h>
 
 #include <string>
 #include <utility>
@@ skipping 1281 matching lines @@
 
 #if defined(OS_WIN)
   system_message_window_.reset(new media::SystemMessageWindowWin);
 #elif defined(OS_LINUX) && defined(USE_UDEV)
   device_monitor_linux_.reset(
       new media::DeviceMonitorLinux(io_thread_->task_runner()));
 #elif defined(OS_MACOSX)
   device_monitor_mac_.reset(new media::DeviceMonitorMac());
 #endif
 
-#if defined(OS_WIN)
-  UMA_HISTOGRAM_BOOLEAN("Windows.Win32kRendererLockdown",
-                        IsWin32kRendererLockdownEnabled());
-#endif
-
   // RDH needs the IO thread to be created
   {
     TRACE_EVENT0("startup",
       "BrowserMainLoop::BrowserThreadsStarted:InitResourceDispatcherHost");
     // TODO(ananta)
     // We register an interceptor on the ResourceDispatcherHostImpl instance to
     // intercept requests to create handlers for download requests. We need to
     // find a better way to achieve this. Ideally we don't want knowledge of
     // downloads in ResourceDispatcherHostImpl.
     resource_dispatcher_host_.reset(new ResourceDispatcherHostImpl(
@@ skipping 253 matching lines @@
     scoped_refptr<base::SingleThreadTaskRunner> worker_task_runner =
         audio_thread_->task_runner();
     audio_manager_ = media::AudioManager::Create(std::move(audio_task_runner),
                                                  std::move(worker_task_runner),
                                                  MediaInternals::GetInstance());
   }
   CHECK(audio_manager_);
 }
 
 }  // namespace content