Fix all compiler errors found by the new compiler version.

ui/file_manager/image_loader/cache_unittest.js

 // Copyright 2014 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.
 
 'use strict';
 
 function testCreateCacheKey() {
-  var key = Cache.createKey({url: 'http://example.com/image.jpg'});
+  var key = ImageCache.createKey({url: 'http://example.com/image.jpg'});
   assertTrue(!!key);
 }
 
 function testNotCreateCacheKey() {
-  var key = Cache.createKey({url: 'data:xxx'});
+  var key = ImageCache.createKey({url: 'data:xxx'});
   assertFalse(!!key);
 
-  var key = Cache.createKey({url: 'DaTa:xxx'});
+  var key = ImageCache.createKey({url: 'DaTa:xxx'});
   assertFalse(!!key);
 }