Revert "Avoid "=== true" inside code by calling a function that does this for us."

tests/utils/src/DummyCompilerTest.dart

Index: tests/utils/src/DummyCompilerTest.dart
diff --git a/tests/utils/src/DummyCompilerTest.dart b/tests/utils/src/DummyCompilerTest.dart
index 042d9d008f2f2b263deaf4b9311460af05dabf7e..a5e85a0aad4cf2ad715e2dac4b9e682377fa7bf6 100644
--- a/tests/utils/src/DummyCompilerTest.dart
+++ b/tests/utils/src/DummyCompilerTest.dart
@@ -25,9 +25,7 @@ Future<String> provider(Uri uri) {
                   class List {}
                   class Closure {}
                   class Dynamic {}
-                  class Null {}
-                  eqNull(a) {}
-                  eqNullB(a) {}""";
+                  class Null {}""";
     } else {
       source = "#library('lib');";
     }