cc: Remove unused proto conversion code.

cc/layers/picture_layer.h

Index: cc/layers/picture_layer.h
diff --git a/cc/layers/picture_layer.h b/cc/layers/picture_layer.h
index 1aa5303c48dd83dbefc50d8d6cf4bb640d7af634..4eff9f5afa34b47d08c75c2882c8fc7b3fe967bc 100644
--- a/cc/layers/picture_layer.h
+++ b/cc/layers/picture_layer.h
@@ -29,6 +29,9 @@ class CC_EXPORT PictureLayer : public Layer {
   void ClearClient();
 
   void SetNearestNeighbor(bool nearest_neighbor);
+  bool nearest_neighbor() const {
+    return picture_layer_inputs_.nearest_neighbor;
+  }
 
   // Layer interface.
   std::unique_ptr<LayerImpl> CreateLayerImpl(LayerTreeImpl* tree_impl) override;
@@ -39,6 +42,9 @@ class CC_EXPORT PictureLayer : public Layer {
   void SetIsMask(bool is_mask) override;
   sk_sp<SkPicture> GetPicture() const override;
 
+  void SetTypeForProtoSerialization(proto::LayerNode* proto) const override;
+  void ToLayerPropertiesProto(proto::LayerProperties* proto) override;
+
   bool IsSuitableForGpuRasterization() const override;
 
   void RunMicroBenchmark(MicroBenchmark* benchmark) override;
@@ -71,11 +77,6 @@ class CC_EXPORT PictureLayer : public Layer {
   ~PictureLayer() override;
 
   bool HasDrawableContent() const override;
-  void SetTypeForProtoSerialization(proto::LayerNode* proto) const override;
-  void LayerSpecificPropertiesToProto(proto::LayerProperties* proto,
-                                      bool inputs_only) override;
-  void FromLayerSpecificPropertiesProto(
-      const proto::LayerProperties& proto) override;
 
   bool is_mask() const { return is_mask_; }