Delete some dead code in GraphicsLayer

Change-Id: I89470e839cd82361fe7e74d7ed3c27992b3b11eb
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2207949Reviewed-by: Stefan Zager <szager@chromium.org>
Reviewed-by: Chris Harrelson <chrishtr@chromium.org>
Commit-Queue: Chris Harrelson <chrishtr@chromium.org>
Cr-Commit-Position: refs/heads/master@{#769893}

third_party/blink/renderer/platform/graphics/graphics_layer.cc

@@ -72,7 +72,6 @@ GraphicsLayer::GraphicsLayer(GraphicsLayerClient& client)
       contents_visible_(true),
       hit_testable_(false),
       needs_check_raster_invalidation_(false),
-      painted_(false),
       painting_phase_(kGraphicsLayerPaintAllWithOverflowClip),
       parent_(nullptr),
       raster_invalidation_function_(

third_party/blink/renderer/platform/graphics/graphics_layer.h

@@ -121,8 +121,6 @@ class PLATFORM_EXPORT GraphicsLayer : public DisplayItemClient,
   const gfx::Size& Size() const;
   void SetSize(const gfx::Size&);
 
-  void SetRenderingContext(int id);
-
   bool DrawsContent() const { return draws_content_; }
   void SetDrawsContent(bool);
 
@@ -153,8 +151,6 @@ class PLATFORM_EXPORT GraphicsLayer : public DisplayItemClient,
   void SetHitTestable(bool);
   bool GetHitTestable() const { return hit_testable_; }
 
-  void SetFilterQuality(SkFilterQuality);
-
   // Some GraphicsLayers paint only the foreground or the background content
   GraphicsLayerPaintingPhase PaintingPhase() const { return painting_phase_; }
   void SetPaintingPhase(GraphicsLayerPaintingPhase);
@@ -290,8 +286,6 @@ class PLATFORM_EXPORT GraphicsLayer : public DisplayItemClient,
   bool hit_testable_ : 1;
   bool needs_check_raster_invalidation_ : 1;
 
-  bool painted_ : 1;
-
   GraphicsLayerPaintingPhase painting_phase_;
 
   Vector<GraphicsLayer*> children_;
@@ -300,7 +294,6 @@ class PLATFORM_EXPORT GraphicsLayer : public DisplayItemClient,
   IntRect contents_rect_;
 
   scoped_refptr<cc::PictureLayer> layer_;
-  IntSize image_size_;
   scoped_refptr<cc::Layer> contents_layer_;
 
   SquashingDisallowedReasons squashing_disallowed_reasons_ =