webgl: Try changing cube_combinations expectations to Fail.

content/test/gpu/gpu_tests/webgl2_conformance_expectations.py

 # Copyright (c) 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.
 from gpu_tests.webgl_conformance_expectations import WebGLConformanceExpectations
 
 # See the GpuTestExpectations class for documentation.
 
 class WebGL2ConformanceExpectations(WebGLConformanceExpectations):
   def __init__(self, conformance_path):
     super(WebGL2ConformanceExpectations, self).__init__(conformance_path)
@@ skipping 282 matching lines @@
         ['win', 'debug'], bug=542901)
 
     # This test actually passes from time to time.
     self.Fail('deqp/functional/gles3/texturefiltering/cube_sizes_00.html',
         ['win'], bug=606021)
     # More intermittently flaky.
     self.Fail('deqp/functional/gles3/texturefiltering/cube_sizes_03.html',
         ['win'], bug=606021)
 
     # Win / Release.
-    self.Flaky(
+    self.Fail(
         'deqp/functional/gles3/texturefiltering/cube_combinations_01.html',
         ['win', 'release'], bug=607393)
-    self.Flaky(
+    self.Fail(
         'deqp/functional/gles3/texturefiltering/cube_combinations_05.html',
         ['win', 'release'], bug=607393)
 
     # Win / AMD
     # It's unfortunate that this suppression needs to be so broad, but
     # basically any test that uses readPixels is potentially flaky, and
     # it's infeasible to suppress individual failures one by one.
     self.Flaky('conformance2/*', ['win', ('amd', 0x6779)], bug=491419)
     self.Flaky('deqp/*', ['win', ('amd', 0x6779)], bug=491419)
 
@@ skipping 207 matching lines @@
     # self.Fail(page_name,
     #     ['linux', ('nvidia', 0x1), 'debug', 'opengl'])
     # self.Fail(page_name,
     #     ['win', ('nvidia', 0x1), 'debug', 'opengl'])
 
     # Conflicts if between a generic os condition and a specific version
     # self.Fail(page_name,
     #     ['xp', ('nvidia', 0x1), 'debug', 'opengl'])
     # self.Fail(page_name,
     #     ['win', ('nvidia', 0x1), 'debug', 'opengl'])