Remove GPU_FEATURE_TYPE_3D_CSS and --disable-accelerated-layers

ppapi/shared_impl/ppapi_preferences.cc

Index: ppapi/shared_impl/ppapi_preferences.cc
diff --git a/ppapi/shared_impl/ppapi_preferences.cc b/ppapi/shared_impl/ppapi_preferences.cc
index 79d8d27f4fdeffe0360cf45f7de954a1f505db7c..662c8ebd34ae98044193a34dd88163364d9b8b2b 100644
--- a/ppapi/shared_impl/ppapi_preferences.cc
+++ b/ppapi/shared_impl/ppapi_preferences.cc
@@ -26,11 +26,7 @@ Preferences::Preferences(const WebPreferences& prefs)
       is_3d_supported(prefs.flash_3d_enabled),
       is_stage3d_supported(prefs.flash_stage3d_enabled),
       is_stage3d_baseline_supported(prefs.flash_stage3d_baseline_enabled),
-      // This determines both if webgl is supported (experimental_webgl_enabled)
-      // and if it runs in hardware
-      // (accelerated_compositing_for_plugins_enabled)
-      is_webgl_supported(prefs.experimental_webgl_enabled &&
-                         prefs.accelerated_compositing_for_plugins_enabled),
+      is_webgl_supported(prefs.experimental_webgl_enabled),
       is_accelerated_video_decode_enabled(
           prefs.pepper_accelerated_video_decode_enabled) {}