Rename the VM internal 'var' type to 'Dynamic' type.

tests/language/src/TypeVMTest.dart

 // Copyright (c) 2011, 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.
 // VMOptions=--enable_type_checks --enable_asserts
 //
 // Dart test program testing type checks.
 
 class TypeTest {
   static test() {
     int result = 0;
@@ skipping 106 matching lines @@
   static testAnyFunction() {
     int result = 0;
     Function anyFunction;
     f() { };
     anyFunction = f;  // No error.
     try {
       int i = f;  // Throws a TypeError if type checks are enabled.
     } catch (TypeError error) {
       result = 1;
       Expect.equals("int", error.dstType);
-      Expect.equals("() => var", error.srcType);  // TODO(regis): => Dynamic.
+      Expect.equals("() => Dynamic", error.srcType);
       Expect.equals("i", error.dstName);
       int pos = error.url.lastIndexOf("/", error.url.length);
       if (pos == -1) {
         pos = error.url.lastIndexOf("\\", error.url.length);
       }
       String subs = error.url.substring(pos + 1, error.url.length);
       Expect.equals("TypeVMTest.dart", subs);
       Expect.equals(123, error.line);
       Expect.equals(15, error.column);
     }
@@ skipping 332 matching lines @@
 class C {
   factory C() {
     return 1;  // Implicit result type is 'C', not int.
   }
 }
 
 
 main() {
   TypeTest.testMain();
 }