Remove GPU_FEATURE_TYPE_3D_CSS and --disable-accelerated-layers

content/renderer/web_preferences.cc

Index: content/renderer/web_preferences.cc
diff --git a/content/renderer/web_preferences.cc b/content/renderer/web_preferences.cc
index 237d7dd9851655053db108419eafc8193d41e161..4a25b7e41ff4a746c83ab2fba2cc5c91519384ff 100644
--- a/content/renderer/web_preferences.cc
+++ b/content/renderer/web_preferences.cc
@@ -231,17 +231,14 @@ void ApplyWebPreferences(const WebPreferences& prefs, WebView* web_view) {
   settings->setGestureTapHighlightEnabled(prefs.gesture_tap_highlight_enabled);
 
   // Enabling accelerated layers from the command line enabled accelerated
-  // 3D CSS, Video, and Animations.
-  settings->setAcceleratedCompositingFor3DTransformsEnabled(
-      prefs.accelerated_compositing_for_3d_transforms_enabled);
+  // Video.
   settings->setAcceleratedCompositingForVideoEnabled(
       prefs.accelerated_compositing_for_video_enabled);
-  settings->setAcceleratedCompositingForAnimationEnabled(
-      prefs.accelerated_compositing_for_animation_enabled);
 
-  // Enabling accelerated plugins if specified from the command line.
-  settings->setAcceleratedCompositingForPluginsEnabled(
-      prefs.accelerated_compositing_for_plugins_enabled);
+  // Always enable composited 3D css, animations and plugins.
+  settings->setAcceleratedCompositingFor3DTransformsEnabled(true);
+  settings->setAcceleratedCompositingForAnimationEnabled(true);
+  settings->setAcceleratedCompositingForPluginsEnabled(true);
 
   // WebGL and accelerated 2D canvas are always gpu composited.
   settings->setAcceleratedCompositingForCanvasEnabled(