refactoring GravityForceLabAlertManager, and remove unused parameters…

…/vars etc, update visibility annotations, phetsims/gravity-force-lab-basics#134

js/view/ISLCAlertManager.js

@@ -15,7 +15,6 @@ define( require => {
   const ActivationUtterance = require( 'SCENERY_PHET/accessibility/ActivationUtterance' );
   const inverseSquareLawCommon = require( 'INVERSE_SQUARE_LAW_COMMON/inverseSquareLawCommon' );
   const ISLCA11yStrings = require( 'INVERSE_SQUARE_LAW_COMMON/ISLCA11yStrings' );
-  const PositionDescriber = require( 'INVERSE_SQUARE_LAW_COMMON/view/describers/PositionDescriber' );
   const utteranceQueue = require( 'SCENERY_PHET/accessibility/utteranceQueue' );
   const ValueChangeUtterance = require( 'SCENERY_PHET/accessibility/ValueChangeUtterance' );
 
@@ -27,20 +26,17 @@ define( require => {
     /**
      * @param {ISLCModel} model
      * @param {ForceDescriber} forceDescriber
-     * @param {PositionDescriber} positionDescriber
      */
-    constructor( model, forceDescriber, positionDescriber ) {
+    constructor( model, forceDescriber ) {
 
-      assert && assert( positionDescriber instanceof PositionDescriber );
       // @protected
       this.forceDescriber = forceDescriber;
-      this.positionDescriber = positionDescriber;
       this.model = model;
 
       // @public {Utterance} - utterances to be added to utteranceQueue, can be used to leverage
       // alertStableDelay feature so this alert content doesn't hit the user too frequently
       this.showForceValuesUtterance = new ActivationUtterance();
-      this.positionUtterance = new ValueChangeUtterance();
+      this.positionUtterance = new ValueChangeUtterance(); // TODO: delete me depending on https://github.com/phetsims/gravity-force-lab-basics/issues/146
     }
 
     /**

js/view/describers/ForceDescriber.js

@@ -261,7 +261,6 @@ define( require => {
      * @public
      */
     getScientificNotationAlertText() {
-
       if ( this.scientificNotationProperty.get() ) {
         return forcesInScientificNotationString;
       }