Revert "Parts must start with 'part of'" and "Attempt to fix VM build"

dart/lib/compiler/implementation/types/concrete_types_inferrer.dart

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
-part of types;
-
 class CancelTypeInferenceException {
   final Node node;
   final String reason;
 
   CancelTypeInferenceException(this.node, this.reason);
 }
 
 /**
  * A singleton concrete type. More precisely, a [BaseType] is one of the
  * following:
@@ skipping 1230 matching lines @@
     Element element = elements[node];
     inferrer.addCaller(element, currentMethod);
     return inferrer.getSendReturnType(element, null,
         analyzeArguments(node.arguments));
   }
 
   void internalError(String reason, {Node node}) {
     inferrer.fail(node, reason);
   }
 }