Replaced ExternallyUnmountedEvent with CustomEvent<!VolumeInfo>

Change-Id: I0199eb2d1e573ac1ca6a368380f2c8dd08cf5b93
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1616705Reviewed-by: Luciano Pacheco <lucmult@chromium.org>
Commit-Queue: Luciano Pacheco <lucmult@chromium.org>
Auto-Submit: François Degros <fdegros@chromium.org>
Cr-Commit-Position: refs/heads/master@{#660730}

ui/file_manager/audio_player/js/audio_player.js

@@ -268,8 +268,8 @@ AudioPlayer.prototype.onExternallyUnmounted_ = function(event) {
     return;
   }
 
-  if (this.volumeManager_.getVolumeInfo(this.selectedEntry_) ===
-      event.volumeInfo) {
+  event = /** @type {!ExternallyUnmountedEvent} */ (event);
+  if (this.volumeManager_.getVolumeInfo(this.selectedEntry_) === event.detail) {
     window.close();
   }
 };

ui/file_manager/base/js/filtered_volume_manager.js

@@ -232,7 +232,7 @@ class FilteredVolumeManager extends cr.EventTarget {
         break;
       case 'externally-unmounted':
         event = /** @type {!ExternallyUnmountedEvent} */ (event);
-        if (this.isAllowedVolume_(event.volumeInfo)) {
+        if (this.isAllowedVolume_(event.detail)) {
           this.dispatchEvent(event);
         }
         break;

ui/file_manager/externs/volume_manager.js

@@ -122,12 +122,7 @@ VolumeManager.prototype.getDefaultDisplayRoot = function(callback) {};
 
 /**
  * Event object which is dispached with 'externally-unmounted' event.
- * @constructor
- * @extends {Event}
+ * @typedef {!CustomEvent<!VolumeInfo>}
  */
-function ExternallyUnmountedEvent() {}
+let ExternallyUnmountedEvent;
 
-/**
- * @type {!VolumeInfo}
- */
-ExternallyUnmountedEvent.prototype.volumeInfo;

ui/file_manager/file_manager/background/js/volume_manager_impl.js

@@ -206,9 +206,8 @@ class VolumeManagerImpl extends cr.EventTarget {
               null;
           if (event.status === 'success' && !requested && volumeInfo) {
             console.warn('Unmounted volume without a request: ' + volumeId);
-            const e = new Event('externally-unmounted');
-            e.volumeInfo = volumeInfo;
-            this.dispatchEvent(e);
+            this.dispatchEvent(
+                new CustomEvent('externally-unmounted', {detail: volumeInfo}));
           }
 
           this.finishRequest_(requestKey, status);

ui/file_manager/gallery/js/gallery.js

@@ -266,8 +266,8 @@ Gallery.prototype.onExternallyUnmounted_ = function(event) {
     return;
   }
 
-  if (this.volumeManager_.getVolumeInfo(this.selectedEntry_) ===
-      event.volumeInfo) {
+  event = /** @type {!ExternallyUnmountedEvent} */ (event);
+  if (this.volumeManager_.getVolumeInfo(this.selectedEntry_) === event.detail) {
     window.close();
   }
 };