Unblock Catapult rolls.

content/test/gpu/gpu_tests/webgl_conformance_expectations_unittest.py

Index: content/test/gpu/gpu_tests/webgl_conformance_expectations_unittest.py
diff --git a/content/test/gpu/gpu_tests/webgl_conformance_expectations_unittest.py b/content/test/gpu/gpu_tests/webgl_conformance_expectations_unittest.py
index 0e97c15276f28a82cc2a10135a63624c036cbfc7..d2d8dc5b9695efa76efd6e13f9ebc9daee57b39d 100644
--- a/content/test/gpu/gpu_tests/webgl_conformance_expectations_unittest.py
+++ b/content/test/gpu/gpu_tests/webgl_conformance_expectations_unittest.py
@@ -32,6 +32,10 @@ class FakeWindowsPlatform(fakes.FakePlatform):
   def GetOSVersionName(self):
     return 'win8'
 
+  def GetOSVersionDetailString(self):
+    # Not sure whether this is accurate.
+    return 'Windows 8.1'
+
 
 class WebGLTestInfo(object):
   def __init__(self, url):