Re-Re-Enable CastV2PerformanceTest

As far as I know, all outstanding issues have been resolved in
separate CLs. Time to re-re-enable the test.

BUG=356842

Review URL: https://codereview.chromium.org/551153002

Cr-Commit-Position: refs/heads/master@{#293839}

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

@@ -661,8 +661,7 @@ class CastV2PerformanceTest
 
 }  // namespace
 
-// crbug.com/356842
-IN_PROC_BROWSER_TEST_P(CastV2PerformanceTest, DISABLED_Performance) {
+IN_PROC_BROWSER_TEST_P(CastV2PerformanceTest, Performance) {
   RunTest("CastV2Performance");
 }