Allow default font size changing on Linux.

chrome/browser/resources/chromeos/chromevox/common/editable_text_area_shadow_test.unitjs

 // 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.
 
 // Include test fixture.
 GEN_INCLUDE(['../testing/chromevox_unittest_base.js']);
 
 /**
  * Test fixture.
  * @constructor
@@ skipping 30 matching lines @@
   assertEquals(2, shadow.getLineIndex(5));
   assertEquals(2, shadow.getLineIndex(8));
   assertEquals(3, shadow.getLineIndex(9));
   assertEquals(4, shadow.getLineIndex(10));
   assertEquals(4, shadow.getLineIndex(14));
 });
 
 /**
  * Test the get line of a multiline textarea with wrapping instead of
  * explicit newlines.
+ * Test disabled due to not being reliable if font size changes.
+ * See https://codereview.chromium.org/549303004/
  */
-TEST_F('CvoxShadowUnitTest', 'MultilineWrap', function() {
+TEST_F('CvoxShadowUnitTest', 'DISABLED_MultilineWrap', function() {
   this.loadDoc(function() {/*!
     <div><textarea id="area"
           cols=4 rows=20>One two thr fou fiv six sev eig</textarea>
     </div> */});
 
   var area = $('area');
 
   var shadow = new cvox.EditableTextAreaShadow();
   shadow.update(area);
   for (var i = 0; i < 32; i++) {
     assertEquals(Math.floor(i / 4), shadow.getLineIndex(i));
   }
 });