Backed out changeset 5bde2c12831c (bug 594876) for failing reftest preserves3d-nested.html at least on Linux. r=backout

gfx/thebes/gfxPlatformGtk.h

@@ -137,11 +137,6 @@ public:
 #endif
 
 protected:
-
-    virtual bool AccelerateLayersByDefault() override {
-      return true;
-    }
-
     static gfxFontconfigUtils *sFontconfigUtils;
 
     int8_t mMaxGenericSubstitutions;