Delete accidentally missed code.

graphics/include/game/graphics/shader_program.hpp

@@ -15,8 +15,6 @@ namespace graphics {
   struct shader_program : public identity<shader_program> {
     shader_program(unsigned int id, identity<shader>, identity<shader>);
 
-    void activate() const;
-
     identity<shader> fragment_shader;
     identity<shader> vertex_shader;
   };

graphics/src/shader_program.cpp

@@ -15,5 +15,3 @@ shader_program::shader_program(unsigned int id, identity<shader> frag,
                                identity<shader> vert)
     : identity<shader_program>(id), fragment_shader(frag), vertex_shader(vert) {
 }
-
-void shader_program::activate() const { shaders::activate(id); }