Remove uses of PaintBehaviorFlattenCompositingLayers

sky/engine/core/rendering/InlineFlowBox.cpp

Index: sky/engine/core/rendering/InlineFlowBox.cpp
diff --git a/sky/engine/core/rendering/InlineFlowBox.cpp b/sky/engine/core/rendering/InlineFlowBox.cpp
index d3bf1dbbafd8c239b7131884f9091df1b6885c0e..3f997b9f95d8fd79c9d7f98f6b3d54f001631c37 100644
--- a/sky/engine/core/rendering/InlineFlowBox.cpp
+++ b/sky/engine/core/rendering/InlineFlowBox.cpp
@@ -1203,36 +1203,18 @@ void InlineFlowBox::paintMask(PaintInfo& paintInfo, const LayoutPoint& paintOffs
     const NinePieceImage& maskNinePieceImage = renderer().style()->maskBoxImage();
     StyleImage* maskBoxImage = renderer().style()->maskBoxImage().image();
 
-    // Figure out if we need to push a transparency layer to render our mask.
-    bool pushTransparencyLayer = false;
-    bool flattenCompositingLayers = renderer().view()->frameView() && renderer().view()->frameView()->paintBehavior() & PaintBehaviorFlattenCompositingLayers;
-    CompositeOperator compositeOp = CompositeSourceOver;
-    if (flattenCompositingLayers) {
-        if ((maskBoxImage && renderer().style()->maskLayers().hasImage()) || renderer().style()->maskLayers().next())
-            pushTransparencyLayer = true;
-
-        compositeOp = CompositeDestinationIn;
-        if (pushTransparencyLayer) {
-            paintInfo.context->setCompositeOperation(CompositeDestinationIn);
-            paintInfo.context->beginTransparencyLayer(1.0f);
-            compositeOp = CompositeSourceOver;
-        }
-    }
-
     LayoutRect paintRect = LayoutRect(adjustedPaintOffset, frameRect.size());
-    paintFillLayers(paintInfo, Color::transparent, renderer().style()->maskLayers(), paintRect, compositeOp);
+    paintFillLayers(paintInfo, Color::transparent, renderer().style()->maskLayers(), paintRect, CompositeSourceOver);
 
     bool hasBoxImage = maskBoxImage && maskBoxImage->canRender(renderer());
     if (!hasBoxImage || !maskBoxImage->isLoaded()) {
-        if (pushTransparencyLayer)
-            paintInfo.context->endLayer();
         return; // Don't paint anything while we wait for the image to load.
     }
 
     // The simple case is where we are the only box for this object.  In those
     // cases only a single call to draw is required.
     if (!prevLineBox() && !nextLineBox()) {
-        boxModelObject()->paintNinePieceImage(paintInfo.context, LayoutRect(adjustedPaintOffset, frameRect.size()), renderer().style(), maskNinePieceImage, compositeOp);
+        boxModelObject()->paintNinePieceImage(paintInfo.context, LayoutRect(adjustedPaintOffset, frameRect.size()), renderer().style(), maskNinePieceImage, CompositeSourceOver);
     } else {
         // We have a mask image that spans multiple lines.
         // We need to adjust _tx and _ty by the width of all previous lines.
@@ -1250,11 +1232,8 @@ void InlineFlowBox::paintMask(PaintInfo& paintInfo, const LayoutPoint& paintOffs
         LayoutRect clipRect = clipRectForNinePieceImageStrip(this, maskNinePieceImage, paintRect);
         GraphicsContextStateSaver stateSaver(*paintInfo.context);
         paintInfo.context->clip(clipRect);
-        boxModelObject()->paintNinePieceImage(paintInfo.context, LayoutRect(stripX, stripY, stripWidth, stripHeight), renderer().style(), maskNinePieceImage, compositeOp);
+        boxModelObject()->paintNinePieceImage(paintInfo.context, LayoutRect(stripX, stripY, stripWidth, stripHeight), renderer().style(), maskNinePieceImage, CompositeSourceOver);
     }
-
-    if (pushTransparencyLayer)
-        paintInfo.context->endLayer();
 }
 
 InlineBox* InlineFlowBox::firstLeafChild() const