Change polymer tests to use internal test_controller, not unittest/test_controller.

pkg/polymer/lib/src/build/linter.dart

Index: pkg/polymer/lib/src/build/linter.dart
diff --git a/pkg/polymer/lib/src/build/linter.dart b/pkg/polymer/lib/src/build/linter.dart
index 3c5fa20d3aff6ceba0af6e67acfa860ff9becff4..75374f59926cc69fef6e43874bd4725128541f32 100644
--- a/pkg/polymer/lib/src/build/linter.dart
+++ b/pkg/polymer/lib/src/build/linter.dart
@@ -220,7 +220,6 @@ class _ElementSummary {
 class _LinterVisitor extends TreeVisitor {
   TransformLogger _logger;
   bool _inPolymerElement = false;
-  bool _dartJSSeen = false;
   bool _dartTagSeen = false;
   bool _isEntrypoint;
   Map<String, _ElementSummary> _elements;
@@ -369,11 +368,6 @@ class _LinterVisitor extends TreeVisitor {
       _logger.warning(BOOT_JS_DEPRECATED, span: node.sourceSpan);
       return;
     }
-    if (src == 'packages/browser/dart.js' ||
-        src == 'packages/unittest/test_controller.js') {
-      _dartJSSeen = true;
-      return;
-    }
 
     if (src.endsWith('.dart') && !isDart) {
       _logger.warning('Wrong script type, expected type="application/dart".',