Remove Win32k fieldtrial, flag and switches, and make default enabled.

content/public/common/content_switches.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/public/common/content_switches.h"
 
 namespace switches {
 
 // The number of MSAA samples for canvas2D. Requires MSAA support by GPU to
 // have an effect. 0 disables MSAA.
@@ skipping 963 matching lines @@
     "disable-core-animation-plugins";
 #endif
 
 #if defined(OS_WIN)
 // Device scale factor passed to certain processes like renderers, etc.
 const char kDeviceScaleFactor[]     = "device-scale-factor";
 
 // Disable the Legacy Window which corresponds to the size of the WebContents.
 const char kDisableLegacyIntermediateWindow[] = "disable-legacy-window";
 
-// Enables or disables the Win32K process mitigation policy for renderer
-// processes which prevents them from invoking user32 and gdi32 system calls
-// which enter the kernel. This is only supported on Windows 8 and beyond.
+// Disables the Win32K process mitigation policy for renderer processes.
 const char kDisableWin32kRendererLockDown[] =
     "disable-win32k-renderer-lockdown";
-const char kEnableWin32kRendererLockDown[] =
-    "enable-win32k-renderer-lockdown";
 
 // DirectWrite FontCache is shared by browser to renderers using shared memory.
 // This switch allows us to pass the shared memory handle to the renderer.
 const char kFontCacheSharedHandle[] = "font-cache-shared-handle";
 
 // Sets the free memory thresholds below which the system is considered to be
 // under moderate and critical memory pressure. Used in the browser process,
 // and ignored if invalid. Specified as a pair of comma separated integers.
 // See base/win/memory_pressure_monitor.cc for defaults.
 const char kMemoryPressureThresholdsMb[] = "memory-pressure-thresholds-mb";
 
 // Enables the exporting of the tracing events to ETW. This is only supported on
 // Windows Vista and later.
 const char kTraceExportEventsToETW[] = "trace-export-events-to-etw";
 #endif
 
 // Enables the use of NPAPI plugins.
 const char kEnableNpapi[]                   = "enable-npapi";
 
 // Don't dump stuff here, follow the same order as the header.
 
 }  // namespace switches