Added the AutoEnrollmentClient and unit tests for it.

chrome/browser/automation/automation_provider_observers.cc

 // Copyright (c) 2011 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.
 
 #include "chrome/browser/automation/automation_provider_observers.h"
 
 #include <deque>
 #include <string>
 #include <vector>
 
@@ skipping 3040 matching lines @@
     PostCallbackAfterPolicyUpdates(
         base::Bind(&PolicyUpdatesObserver::Reply, base::Owned(this)));
   }
 }
 
 void PolicyUpdatesObserver::Reply() {
   if (automation_) {
     AutomationJSONReply(
         automation_, reply_message_.release()).SendSuccess(NULL);
   }
+  // Reply() is only called from MaybeReply(), which makes the callback own
+  // |this|; so |this| will be deleted once this method returns.
 }
 
 // static
 void PolicyUpdatesObserver::PostTask(content::BrowserThread::ID id,
                                      const base::Closure& callback) {
   content::BrowserThread::PostTask(id, FROM_HERE, callback);
 }
 
 #endif  // defined(ENABLE_CONFIGURATION_POLICY)
 
@@ skipping 21 matching lines @@
   }
 
   ExtensionHost* host = content::Details<ExtensionHost>(details).ptr();
   if (host->extension_id() == extension_id_ &&
       host->extension_host_type() == chrome::VIEW_TYPE_EXTENSION_POPUP) {
     AutomationJSONReply(automation_, reply_message_.release())
         .SendSuccess(NULL);
     delete this;
   }
 }