Remove FlutterView.onResume (#2768)

It's empty and is easily confused with onPostResume

Author: jason-simmons

sky/shell/platform/android/io/flutter/view/FlutterView.java

@@ -177,9 +177,6 @@ public void onPause() {
         mSkyEngine.onAppLifecycleStateChanged(AppLifecycleState.PAUSED);
     }
 
-    public void onResume() {
-    }
-
     public void onPostResume() {
         mSkyEngine.onAppLifecycleStateChanged(AppLifecycleState.RESUMED);
     }

sky/shell/platform/android/org/domokit/sky/shell/SkyActivity.java

@@ -105,14 +105,6 @@ protected void onPause() {
         }
     }
 
-    @Override
-    protected void onResume() {
-        super.onResume();
-        if (mView != null) {
-            mView.onResume();
-        }
-    }
-
     @Override
     protected void onPostResume() {
         super.onPostResume();