Disable failing CastV2Performance tests.

BUG=356842
TBR=hubbe@chromium.org

Review URL: https://codereview.chromium.org/506363002

Cr-Commit-Position: refs/heads/master@{#292065}

chrome/browser/extensions/api/cast_streaming/performance_test.cc

@@ -660,7 +660,8 @@ class CastV2PerformanceTest
 
 }  // namespace
 
-IN_PROC_BROWSER_TEST_P(CastV2PerformanceTest, Performance) {
+// crbug.com/356842
+IN_PROC_BROWSER_TEST_P(CastV2PerformanceTest, DISABLED_Performance) {
   RunTest("CastV2Performance");
 }