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

content/public/common/content_switches.cc

Index: content/public/common/content_switches.cc
diff --git a/content/public/common/content_switches.cc b/content/public/common/content_switches.cc
index e0d979f7c4c8380e34b2ef9d22eb335091d71cb8..01fd50fae254d857e507acddb7c706902196342a 100644
--- a/content/public/common/content_switches.cc
+++ b/content/public/common/content_switches.cc
@@ -981,13 +981,9 @@ 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.