Reuse existing test instead of duplicating code.

dart/tests/lib/mirrors/library_metadata_test.dart

Index: dart/tests/lib/mirrors/library_metadata_test.dart
diff --git a/dart/tests/lib/mirrors/library_metadata_test.dart b/dart/tests/lib/mirrors/library_metadata_test.dart
index 3ae8b11d101dd063b44d8961d952b84a507c7980..259e398b1756302666d60a2e14ffc28975447d10 100644
--- a/dart/tests/lib/mirrors/library_metadata_test.dart
+++ b/dart/tests/lib/mirrors/library_metadata_test.dart
@@ -7,39 +7,10 @@ library test.library_metadata_test;
 
 import 'dart:mirrors';
 
-const string = 'a metadata string';
-
-const symbol = const Symbol('symbol');
-
-const hest = 'hest';
-
-checkMetadata(DeclarationMirror mirror, List expectedMetadata) {
-  List metadata = mirror.metadata.map((m) => m.reflectee).toList();
-  if (metadata == null) {
-    throw 'Null metadata on $mirror';
-  }
-  int expectedLength = expectedMetadata.length;
-  int actualLength = metadata.length;
-  if (expectedLength != actualLength) {
-    throw 'Expected length = $expectedLength, but got length = $actualLength.';
-  }
-  for (int i = 0; i < expectedLength; i++) {
-    if (metadata[i] != expectedMetadata[i]) {
-      throw '${metadata[i]} is not "${expectedMetadata[i]}"'
-          ' in $mirror at index $i';
-    }
-  }
-  print(metadata);
-}
+import 'metadata_test.dart';
 
 main() {
-  if (MirrorSystem.getName(symbol) != 'symbol') {
-    // This happened in dart2js due to how early library metadata is
-    // computed.
-    throw 'Bad constant: $symbol';
-  }
-
   MirrorSystem mirrors = currentMirrorSystem();
   checkMetadata(mirrors.findLibrary(const Symbol('test.library_metadata_test')).first,
-                [string, symbol]); 
+                [string, symbol]);
 }