Fix analyzer warnings in js_util_test, skip js_util_test in csp mode and baseline expectations for …

tests/lib/analyzer/analyze_library.status

Index: tests/lib/analyzer/analyze_library.status
diff --git a/tests/lib/analyzer/analyze_library.status b/tests/lib/analyzer/analyze_library.status
index b86abdc3174fa5a0ff4cc9f4b75f9bf3d9bb98aa..98b521c5610ab4f24f6706e79b5156c3adb5be34 100644
--- a/tests/lib/analyzer/analyze_library.status
+++ b/tests/lib/analyzer/analyze_library.status
@@ -9,6 +9,7 @@ lib/_chrome/dart2js/chrome_dart2js: CompileTimeError # Issue 16522
 lib/html/html_common/html_common_dart2js: CompileTimeError # Issue 16522
 lib/indexed_db/dart2js/indexed_db_dart2js: CompileTimeError # Issue 16522
 lib/js/dart2js/js_dart2js: CompileTimeError # Issue 16522
+lib/js_util/dart2js/js_util_dart2js: CompileTimeError # Issue 16522
 lib/svg/dart2js/svg_dart2js: CompileTimeError # Issue 16522
 lib/typed_data/dart2js/native_typed_data_dart2js: CompileTimeError # Issue 16522
 lib/typed_data/dart2js/typed_data_dart2js: CompileTimeError # Issue 16522
@@ -25,4 +26,5 @@ lib/indexed_db/dartium/indexed_db_dartium: StaticWarning # Issue 21647
 lib/web_audio/dartium/web_audio_dartium: StaticWarning # Issue 21647
 lib/svg/dartium/svg_dartium: StaticWarning # Issue 21647
 lib/_blink/dartium/_blink_dartium: StaticWarning # Undefined Creates and Returns classes
-lib/js/dartium/js_dartium: StaticWarning # Undefined Creates and Returns classes
+lib/js/dartium/js_dartium: StaticWarning # Undefined Creates and Returns classes
+lib/js_util/dartium/js_util_dartium: StaticWarning # Issue 21647