[gpu tests] Unpack only first two values returned from GetExpectationsForTest

Changes to typ may cause the number of values returned from GetExpectationsForTest
to change. We only want the first 2 values in gpu test code.

Bug: chromium:986447
Change-Id: Iec3dbf25b14e24af774ad5656bd63d94e5ee8a1d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1915183Reviewed-by: Yuly Novikov <ynovikov@chromium.org>
Commit-Queue: Rakib Hasan <rmhasan@google.com>
Cr-Commit-Position: refs/heads/master@{#715148}

content/test/gpu/gpu_tests/gpu_integration_test.py

@@ -164,8 +164,7 @@ class GpuIntegrationTest(
       cls.StartBrowser()
 
   def _RunGpuTest(self, url, test_name, *args):
-    expected_results, should_retry_on_failure = (
-        self.GetExpectationsForTest())
+    expected_results, should_retry_on_failure = self.GetExpectationsForTest()[:2]
     try:
       # TODO(nednguyen): For some reason the arguments are getting wrapped
       # in another tuple sometimes (like in the WebGL extension tests).