Re-enable solid background color optimization for composited layers.

Source/core/rendering/CompositedLayerMapping.cpp

Index: Source/core/rendering/CompositedLayerMapping.cpp
diff --git a/Source/core/rendering/CompositedLayerMapping.cpp b/Source/core/rendering/CompositedLayerMapping.cpp
index 6375ac2d8c9ddec6d9505e9581f836c1db940b12..52d780d6ceaeaced826fef2ef570aa54c98909dd 100644
--- a/Source/core/rendering/CompositedLayerMapping.cpp
+++ b/Source/core/rendering/CompositedLayerMapping.cpp
@@ -1313,9 +1313,6 @@ void CompositedLayerMapping::updateBackgroundColor(bool isSimpleContainer)
 
 static bool supportsDirectBoxDecorationsComposition(const RenderObject* renderer)
 {
-    if (!GraphicsLayer::supportsBackgroundColorContent())
-        return false;
-
     if (renderer->hasClip())
         return false;