[Chromecast] Do not run PartitionReallocReturnNullTest.RepeatedReturnNullDirect.

This is known to fail on Cast CQ infra. Disable the new test added here:
https://chromium-review.googlesource.com/1044971

Bug: Internal b/67975693
Test: CQ
Change-Id: I0b07b96f69bbad9a4289f1c58eed3485082cfd9c
Reviewed-on: https://chromium-review.googlesource.com/1053211Reviewed-by: Bailey Forrest <bcf@chromium.org>
Reviewed-by: Stephen Lanham <slan@chromium.org>
Commit-Queue: Stephen Lanham <slan@chromium.org>
Cr-Commit-Position: refs/heads/master@{#557340}

chromecast/BUILD.gn

@@ -206,8 +206,10 @@ cast_test_group("cast_tests") {
     if (target_os == "linux") {
       if (is_cast_desktop_build) {
         # Disable PartitionAllocReturnNullTest.RepeatedReturnNullDirect (b/67975693)
-        gtest_excludes +=
-            [ "PartitionAllocReturnNullTest.RepeatedReturnNullDirect" ]
+        gtest_excludes += [
+          "PartitionAllocReturnNullTest.RepeatedReturnNullDirect",
+          "PartitionReallocReturnNullTest.RepeatedReturnNullDirect",
+        ]
       } else {
         # Disable ProcessMetricsTest.GetNumberOfThreads (b/15610509)
         # Disable ProcessUtilTest.* (need to define OS_ANDROID)