removes opt_this from ol.Collection#forEach

this commit also removes all uses of the standard thisArg of
Array#forEach.

src/ol/interaction/Modify.js

@@ -213,7 +213,7 @@ var _ol_interaction_Modify_ = function(options) {
    */
   this.features_ = features;
 
-  this.features_.forEach(this.addFeature_, this);
+  this.features_.forEach(this.addFeature_.bind(this));
   _ol_events_.listen(this.features_, CollectionEventType.ADD,
       this.handleFeatureAdd_, this);
   _ol_events_.listen(this.features_, CollectionEventType.REMOVE,

src/ol/interaction/Select.js

@@ -313,12 +313,12 @@ _ol_interaction_Select_.prototype.setMap = function(map) {
   var selectedFeatures =
       this.featureOverlay_.getSource().getFeaturesCollection();
   if (currentMap) {
-    selectedFeatures.forEach(currentMap.unskipFeature, currentMap);
+    selectedFeatures.forEach(currentMap.unskipFeature.bind(currentMap));
   }
   Interaction.prototype.setMap.call(this, map);
   this.featureOverlay_.setMap(map);
   if (map) {
-    selectedFeatures.forEach(map.skipFeature, map);
+    selectedFeatures.forEach(map.skipFeature.bind(map));
   }
 };
 

src/ol/interaction/Snap.js

@@ -302,7 +302,7 @@ _ol_interaction_Snap_.prototype.setMap = function(map) {
   if (currentMap) {
     keys.forEach(_ol_events_.unlistenByKey);
     keys.length = 0;
-    features.forEach(this.forEachFeatureRemove_, this);
+    features.forEach(this.forEachFeatureRemove_.bind(this));
   }
   _ol_interaction_Pointer_.prototype.setMap.call(this, map);
 
@@ -322,7 +322,7 @@ _ol_interaction_Snap_.prototype.setMap = function(map) {
               this.handleFeatureRemove_, this)
       );
     }
-    features.forEach(this.forEachFeatureAdd_, this);
+    features.forEach(this.forEachFeatureAdd_.bind(this));
   }
 };
 
@@ -613,7 +613,7 @@ _ol_interaction_Snap_.handleEvent_ = function(evt) {
 _ol_interaction_Snap_.handleUpEvent_ = function(evt) {
   var featuresToUpdate = _ol_obj_.getValues(this.pendingFeatures_);
   if (featuresToUpdate.length) {
-    featuresToUpdate.forEach(this.updateFeature_, this);
+    featuresToUpdate.forEach(this.updateFeature_.bind(this));
     this.pendingFeatures_ = {};
   }
   return false;