[abandoned] Remove the destination file after CopyTask cancelation.

ui/file_manager/file_manager/background/js/file_operation_util.js

Index: ui/file_manager/file_manager/background/js/file_operation_util.js
diff --git a/ui/file_manager/file_manager/background/js/file_operation_util.js b/ui/file_manager/file_manager/background/js/file_operation_util.js
index 19ba98c21523cfd5e94b30f352045a232b4bcd2a..f73b6b0219d80357ecd3728bd5cbdf26ee2d8644 100644
--- a/ui/file_manager/file_manager/background/js/file_operation_util.js
+++ b/ui/file_manager/file_manager/background/js/file_operation_util.js
@@ -350,6 +350,22 @@ fileOperationUtil.copyTo = function(
     source, parent, newName, entryChangedCallback, progressCallback,
     successCallback, errorCallback) {
 
+  var removeDestinationFile = function(callback) {
+    if (source.isFile) {
+      parent.getFile(newName, {}, function(entry) {
+        entry.remove(function() {
+          callback(null);
+        }, callback);
+      }, callback);
+    } else {
+      parent.getDirectory(newName, {}, function(entry) {
+        entry.removeRecursively(function() {
+          callback(null);
+        }, callback);
+      }, callback);
+    }
+  };
+
   /** @type {number|undefined} */
   var copyId;
   var pendingCallbacks = [];
@@ -416,8 +432,18 @@ fileOperationUtil.copyTo = function(
               ' error: ' + status.error);
           chrome.fileManagerPrivate.onCopyProgress.removeListener(
               onCopyProgress);
-          errorCallback(util.createDOMError(status.error));
-          callback();
+          if (status.error === 'AbortError') {
+            removeDestinationFile(function(error) {
+              if (error) {
+                console.error('failed to remove destination file: ' + error);
+              }
+              errorCallback(util.createDOMError(status.error));
+              callback();
+            }.bind(this));
+          } else {
+            errorCallback(util.createDOMError(status.error));
+            callback();
+          }
           break;
 
         default: