Revert of Add drawer with state information

tools/viewer/sk_app/Window.cpp

Index: tools/viewer/sk_app/Window.cpp
diff --git a/tools/viewer/sk_app/Window.cpp b/tools/viewer/sk_app/Window.cpp
index a02e993d21ca6f98a3500190ff5db28a655e6782..b78f39aa3707e5a7b47a79b5d63fdf27505728d9 100644
--- a/tools/viewer/sk_app/Window.cpp
+++ b/tools/viewer/sk_app/Window.cpp
@@ -32,16 +32,12 @@
     return false;
 }
 
-static void default_ui_state_changed_func(
-        const SkString& stateName, const SkString& stateValue, void* userData) {}
-
 static void default_paint_func(SkCanvas*, void* userData) {}
 
 Window::Window() : fCharFunc(default_char_func)
                  , fKeyFunc(default_key_func)
                  , fMouseFunc(default_mouse_func)
                  , fTouchFunc(default_touch_func)
-                 , fUIStateChangedFunc(default_ui_state_changed_func)
                  , fPaintFunc(default_paint_func) {
 }
 
@@ -64,10 +60,6 @@
 
 bool Window::onTouch(int owner, InputState state, float x, float y) {
     return fTouchFunc(owner, state, x, y, fTouchUserData);
-}
-
-void Window::onUIStateChanged(const SkString& stateName, const SkString& stateValue) {
-    return fUIStateChangedFunc(stateName, stateValue, fUIStateChangedUserData);
 }
 
 void Window::onPaint() {