cc: Remove DrawQuad::IterateResoruces

cc/quads/tile_draw_quad.h

Index: cc/quads/tile_draw_quad.h
diff --git a/cc/quads/tile_draw_quad.h b/cc/quads/tile_draw_quad.h
index b858e148d2346f518ebbd840dd3010e9615c4ca4..feb9e87c7cc1541a58bd235ada782bb75ea56e3f 100644
--- a/cc/quads/tile_draw_quad.h
+++ b/cc/quads/tile_draw_quad.h
@@ -41,13 +41,13 @@ class CC_EXPORT TileDrawQuad : public ContentDrawQuadBase {
               bool swizzle_contents,
               bool nearest_neighbor);
 
-  unsigned resource_id;
-
-  void IterateResources(const ResourceIteratorCallback& callback) override;
-
   static const TileDrawQuad* MaterialCast(const DrawQuad*);
 
+  ResourceId resource_id() const { return resources.ids[kResourceIdIndex]; }
+
  private:
+  static const size_t kResourceIdIndex = 0;
+
   void ExtendValue(base::trace_event::TracedValue* value) const override;
 };