Cleanup GraphicsContext by removing unused functions

Source/platform/graphics/GraphicsContext.h

Index: Source/platform/graphics/GraphicsContext.h
diff --git a/Source/platform/graphics/GraphicsContext.h b/Source/platform/graphics/GraphicsContext.h
index 2156d333b7a4c35c8a88a5930526780e72f772ca..1fab5e806e7c9ddebc3821b904759ec895012fd5 100644
--- a/Source/platform/graphics/GraphicsContext.h
+++ b/Source/platform/graphics/GraphicsContext.h
@@ -87,9 +87,6 @@ public:
     const SkCanvas* canvas() const { return m_canvas; }
     bool paintingDisabled() const { return !m_canvas; }
 
-    const SkBitmap* bitmap() const;
-    const SkBitmap& layerBitmap(AccessMode = ReadOnly) const;
-
     // ---------- State management methods -----------------
     void save();
     void restore();
@@ -247,7 +244,6 @@ public:
 
     void drawImage(Image*, const IntPoint&, CompositeOperator = CompositeSourceOver, RespectImageOrientationEnum = DoNotRespectImageOrientation);
     void drawImage(Image*, const IntRect&, CompositeOperator = CompositeSourceOver, RespectImageOrientationEnum = DoNotRespectImageOrientation, bool useLowQualityScale = false);
-    void drawImage(Image*, const IntPoint& destPoint, const IntRect& srcRect, CompositeOperator = CompositeSourceOver, RespectImageOrientationEnum = DoNotRespectImageOrientation);
     void drawImage(Image*, const FloatRect& destRect);
     void drawImage(Image*, const FloatRect& destRect, const FloatRect& srcRect, CompositeOperator = CompositeSourceOver, RespectImageOrientationEnum = DoNotRespectImageOrientation, bool useLowQualityScale = false);
     void drawImage(Image*, const FloatRect& destRect, const FloatRect& srcRect, CompositeOperator, blink::WebBlendMode, RespectImageOrientationEnum = DoNotRespectImageOrientation, bool useLowQualityScale = false);
@@ -312,7 +308,6 @@ public:
     void beginRecording(const FloatRect& bounds);
     PassRefPtr<DisplayList> endRecording();
 
-    bool hasShadow() const;
     void setShadow(const FloatSize& offset, float blur, const Color&,
         DrawLooperBuilder::ShadowTransformMode = DrawLooperBuilder::ShadowRespectsTransforms,
         DrawLooperBuilder::ShadowAlphaMode = DrawLooperBuilder::ShadowRespectsAlpha);
@@ -384,7 +379,6 @@ private:
         return m_paintState;
     }
 
-    static void addCornerArc(SkPath*, const SkRect&, const IntSize&, int);
     static void setPathFromConvexPoints(SkPath*, size_t, const FloatPoint*);
     static void setRadii(SkVector*, IntSize, IntSize, IntSize, IntSize);