Remove TODOs about Robolectric shadow in Snackbar

Author: MGaetan89

lib/java/com/google/android/material/snackbar/Snackbar.java

@@ -126,27 +126,6 @@ private Snackbar(
         (AccessibilityManager) parent.getContext().getSystemService(Context.ACCESSIBILITY_SERVICE);
   }
 
-  // TODO: Delete this once custom Robolectric shadows no longer depend on this method being present
-  // (and instead properly utilize BaseTransientBottomBar hierarchy).
-  @Override
-  public void show() {
-    super.show();
-  }
-
-  // TODO: Delete this once custom Robolectric shadows no longer depend on this method being present
-  // (and instead properly utilize BaseTransientBottomBar hierarchy).
-  @Override
-  public void dismiss() {
-    super.dismiss();
-  }
-
-  // TODO: Delete this once custom Robolectric shadows no longer depend on this method being present
-  // (and instead properly utilize BaseTransientBottomBar hierarchy).
-  @Override
-  public boolean isShown() {
-    return super.isShown();
-  }
-
   /**
    * Make a Snackbar to display a message
    *