Rename dart:typeddata to dart:typed_data.

tests/html/utils.dart

 library TestUtils;
 
 import 'dart:async';
 import 'dart:html';
-import 'dart:typeddata';
+import 'dart:typed_data';
 import '../../pkg/unittest/lib/unittest.dart';
 
 /**
  * Verifies that [actual] has the same graph structure as [expected].
  * Detects cycles and DAG structure in Maps and Lists.
  */
 verifyGraph(expected, actual) {
   var eItems = [];
   var aItems = [];
 
@@ skipping 70 matching lines @@
         }
       }
       return;
     }
 
     expect(false, isTrue, reason: 'Unhandled type: $expected');
   }
 
   walk('', expected, actual);
 }