[Aria tests] Disable a flaky rule (AX_ARIA_08)

chrome/test/data/webui/test_api.js

 // Copyright (c) 2012 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.
 
 /**
  * @fileoverview Library providing basic test framework functionality.
  */
 
 // See assert.js for where this is used.
 this.traceAssertionsForTesting = true;
@@ skipping 193 matching lines @@
             // generally does not apply.
             "pageWithoutTitle",
 
             // TODO(aboxhall): re-enable when crbug.com/267035 is fixed.
             // Until then it's just noise.
             "lowContrastElements",
 
             // TODO(apacible): re-enable when following issue is fixed.
             // github.com/GoogleChrome/accessibility-developer-tools/issues/251
             "tableHasAppropriateHeaders",
+
+            // TODO(crbug.com/657514): This rule is flaky on Linux/ChromeOS.
+            "requiredOwnedAriaRoleMissing",
         ];
       }
       return this.accessibilityAuditConfig_;
     },
 
     /**
      * Whether to treat accessibility issues (errors or warnings) as test
      * failures. If true, any accessibility issues will cause the test to fail.
      * If false, accessibility issues will cause a console.warn.
      * Off by default to begin with; as we add the ability to suppress false
@@ skipping 1512 matching lines @@
   exports.runTest = runTest;
   exports.runTestFunction = runTestFunction;
   exports.DUMMY_URL = DUMMY_URL;
   exports.TEST = TEST;
   exports.TEST_F = TEST_F;
   exports.RUNTIME_TEST_F = TEST_F;
   exports.GEN = GEN;
   exports.GEN_INCLUDE = GEN_INCLUDE;
   exports.WhenTestDone = WhenTestDone;
 })(this);