Take the rotation information from the right source.

ui/file_manager/file_manager/foreground/js/thumbnail_loader_unittest.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.
 
 function getLoadTarget(entry, metadata) {
   return new ThumbnailLoader(entry, null, metadata).getLoadTarget();
 }
 
 /**
  * Generates a data url of a sample image for testing.
@@ skipping 157 matching lines @@
         assertEquals(externalThumbnailDataUrl, result.data);
       }), callback);
 }
 
 function testLoadDetachedFromExifInCavnasModeThumbnailDoesNotRotate(callback) {
   ImageLoaderClient.getInstance = function() {
     return {
       load: function(url, callback, opt_option) {
         // Assert that data url is passed.
         assertTrue(/^data:/i.test(url));
+        // Assert that the rotation is propagated to ImageLoader.
+        assertEquals(1, opt_option.orientation.rotate90);
         // ImageLoader returns rotated image.
         callback({status: 'success', data: generateSampleImageDataUrl(32, 64),
             width: 32, height: 64});
       }
     };
   };
 
   var metadata = {
     thumbnail: {
       url: generateSampleImageDataUrl(64, 32),
@@ skipping 13 matching lines @@
   reportPromise(
     new Promise(function(resolve, reject) {
       thumbnailLoader.loadDetachedImage(resolve);
     }).then(function() {
       var image = thumbnailLoader.getImage();
       // No need to rotate by loadDetachedImage() as it's already done.
       assertEquals(32, image.width);
       assertEquals(64, image.height);
     }), callback);
 }