Gallery: Delete thumbnail cache when the item is deleted.

ui/file_manager/gallery/js/gallery_data_model.js

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 /**
  * Data model for gallery.
  *
  * @param {!MetadataModel} metadataModel
  * @param {!EntryListWatcher=} opt_watcher Entry list watcher.
  * @constructor
@@ skipping 12 matching lines @@
   /**
    * Directory where the image is saved if the image is located in a read-only
    * volume.
    * @public {DirectoryEntry}
    */
   this.fallbackSaveDirectory = null;
 
   // Start to watch file system entries.
   var watcher = opt_watcher ? opt_watcher : new EntryListWatcher(this);
   watcher.getEntry = function(item) { return item.getEntry(); };
+
+  this.addEventListener('splice', this.onSplice_.bind(this));
 }
 
 /**
  * Maximum number of full size image cache.
  * @type {number}
  * @const
  * @private
  */
 GalleryDataModel.MAX_FULL_IMAGE_CACHE_ = 3;
 
@@ skipping 102 matching lines @@
         } else {
           // Force to free the buffer of the canvas by assigning zero size.
           sorted[i].screenImage.width = 0;
           sorted[i].screenImage.height = 0;
           sorted[i].screenImage = null;
         }
       }
     }
   }
 };
+
+/**
+ * Handles entry delete.
+ * @param {!Event} event
+ * @private
+ */
+GalleryDataModel.prototype.onSplice_ = function(event) {
+  if (!event.removed || !event.removed.length)
+    return;
+  var removedURLs = event.removed.map(function(item) {
+    return item.getEntry().toURL();
+  });
+  this.metadataModel_.notifyEntriesRemoved(removedURLs);
+};