Delete remaining masks dead code.

sky/engine/core/rendering/style/FillLayer.h

Index: sky/engine/core/rendering/style/FillLayer.h
diff --git a/sky/engine/core/rendering/style/FillLayer.h b/sky/engine/core/rendering/style/FillLayer.h
index a59fbdd952da275bc9786bf618b5f0d70b735579..9bdc1a044c4f381bc82fa0d780b89c1602bee1d6 100644
--- a/sky/engine/core/rendering/style/FillLayer.h
+++ b/sky/engine/core/rendering/style/FillLayer.h
@@ -80,7 +80,6 @@ public:
     const LengthSize& sizeLength() const { return m_sizeLength; }
     EFillSizeType sizeType() const { return static_cast<EFillSizeType>(m_sizeType); }
     FillSize size() const { return FillSize(static_cast<EFillSizeType>(m_sizeType), m_sizeLength); }
-    EMaskSourceType maskSourceType() const { return static_cast<EMaskSourceType>(m_maskSourceType); }
 
     const FillLayer* next() const { return m_next; }
     FillLayer* next() { return m_next; }
@@ -104,7 +103,6 @@ public:
     bool isCompositeSet() const { return m_compositeSet; }
     bool isBlendModeSet() const { return m_blendModeSet; }
     bool isSizeSet() const { return m_sizeType != SizeNone; }
-    bool isMaskSourceTypeSet() const { return m_maskSourceTypeSet; }
 
     void setImage(PassRefPtr<StyleImage> i) { m_image = i; m_imageSet = true; }
     void setXPosition(const Length& position) { m_xPosition = position; m_xPosSet = true; m_backgroundXOriginSet = false; m_backgroundXOrigin = LeftEdge; }
@@ -121,7 +119,6 @@ public:
     void setSizeType(EFillSizeType b) { m_sizeType = b; }
     void setSizeLength(const LengthSize& l) { m_sizeLength = l; }
     void setSize(FillSize f) { m_sizeType = f.type; m_sizeLength = f.size; }
-    void setMaskSourceType(EMaskSourceType m) { m_maskSourceType = m; m_maskSourceTypeSet = true; }
 
     void clearImage() { m_image.clear(); m_imageSet = false; }
     void clearXPosition()
@@ -143,7 +140,6 @@ public:
     void clearComposite() { m_compositeSet = false; }
     void clearBlendMode() { m_blendModeSet = false; }
     void clearSize() { m_sizeType = SizeNone; }
-    void clearMaskSourceType() { m_maskSourceTypeSet = false; }
 
     FillLayer& operator=(const FillLayer& o);
     FillLayer(const FillLayer& o);
@@ -193,7 +189,6 @@ public:
     static Length initialFillXPosition(EFillLayerType) { return Length(0.0, Percent); }
     static Length initialFillYPosition(EFillLayerType) { return Length(0.0, Percent); }
     static StyleImage* initialFillImage(EFillLayerType) { return 0; }
-    static EMaskSourceType initialFillMaskSourceType(EFillLayerType) { return MaskAlpha; }
 
 private:
     friend class RenderStyle;
@@ -219,7 +214,6 @@ private:
     unsigned m_composite : 4; // CompositeOperator
     unsigned m_sizeType : 2; // EFillSizeType
     unsigned m_blendMode : 5; // WebBlendMode
-    unsigned m_maskSourceType : 1; // EMaskSourceType
     unsigned m_backgroundXOrigin : 2; // BackgroundEdgeOrigin
     unsigned m_backgroundYOrigin : 2; // BackgroundEdgeOrigin
 
@@ -235,7 +229,6 @@ private:
     unsigned m_backgroundYOriginSet : 1;
     unsigned m_compositeSet : 1;
     unsigned m_blendModeSet : 1;
-    unsigned m_maskSourceTypeSet : 1;
 
     unsigned m_type : 1; // EFillLayerType