Ensure the destination url reported to ImportHistory is correctly encoded.

ui/file_manager/file_manager/common/js/mock_entry.js

Index: ui/file_manager/file_manager/common/js/mock_entry.js
diff --git a/ui/file_manager/file_manager/common/js/mock_entry.js b/ui/file_manager/file_manager/common/js/mock_entry.js
index 7f3515529380cb33e0652ba7f3bf13b0f86d1c67..290b11e7097580dab3269e71de5fb39706ba338b 100644
--- a/ui/file_manager/file_manager/common/js/mock_entry.js
+++ b/ui/file_manager/file_manager/common/js/mock_entry.js
@@ -109,7 +109,12 @@ MockEntry.prototype = {
  * @return {string} Fake URL.
  */
 MockEntry.prototype.toURL = function() {
-  return this.filesystem.rootURL + this.fullPath;
+  var segments = this.fullPath.split('/');
+  for (var i = 0; i < segments.length; i++) {
+    segments[i] = encodeURIComponent(segments[i]);
+  }
+
+  return this.filesystem.rootURL + segments.join('/');
 };
 
 /**