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

content/common/content_switches_internal.cc

Index: content/common/content_switches_internal.cc
diff --git a/content/common/content_switches_internal.cc b/content/common/content_switches_internal.cc
index 07d064e98eee7876b8839608bf515eba152fcff8..c13396ea3cac087b248c49d79ce8ad0b3e7ef6cc 100644
--- a/content/common/content_switches_internal.cc
+++ b/content/common/content_switches_internal.cc
@@ -50,8 +50,6 @@ void DisableWin32kRendererLockdown() {
 }
 
 bool IsWin32kRendererLockdownEnabled() {
-  const std::string group_name =
-      base::FieldTrialList::FindFullName("Win32kLockdown");
   if (g_win32k_renderer_lockdown_disabled)
     return false;
   if (base::win::GetVersion() < base::win::VERSION_WIN8)
@@ -59,12 +57,9 @@ bool IsWin32kRendererLockdownEnabled() {
   if (!gfx::win::ShouldUseDirectWrite())
     return false;
   const base::CommandLine* cmd_line = base::CommandLine::ForCurrentProcess();
-  if (cmd_line->HasSwitch(switches::kEnableWin32kRendererLockDown))
-    return true;
   if (cmd_line->HasSwitch(switches::kDisableWin32kRendererLockDown))
     return false;
-  // Default.
-  return group_name != "Disabled";
+  return true;
 }
 #endif