Describe .nc files as "No Compile Test" suites and link doc.

base/callback_list_unittest.nc

 // Copyright 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
+// This is a "No Compile Test" suite.
+// http://dev.chromium.org/developers/testing/no-compile-tests
+
 #include "base/callback_list.h"
 
 #include "base/basictypes.h"
 #include "base/bind.h"
 #include "base/bind_helpers.h"
 #include "base/memory/scoped_ptr.h"
 
 namespace base {
 
 class Foo {
@@ skipping 27 matching lines @@
   FooListener f;
   CallbackList<void(scoped_ptr<Foo>)> c1;
   scoped_ptr<CallbackList<void(scoped_ptr<Foo>)>::Subscription> sub =
       c1.Add(Bind(&FooListener::GotAScopedFoo, Unretained(&f)));
   c1.Notify(scoped_ptr<Foo>(new Foo()));
 }
 
 #endif
 
 }  // namespace base