This is the first pass at making GetIPConfigs asynchronous.

chromeos/dbus/shill_ipconfig_client.cc

 // Copyright (c) 2012 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 "chromeos/dbus/shill_ipconfig_client.h"
 
 #include "base/bind.h"
 #include "base/message_loop.h"
 #include "base/stl_util.h"
 #include "base/values.h"
@@ skipping 221 matching lines @@
   }
 
   virtual bool CallRemoveAndBlock(
       const dbus::ObjectPath& ipconfig_path) OVERRIDE {
     return true;
   }
 
  private:
   // Runs callback with |properties_|.
   void PassProperties(const DictionaryValueCallback& callback) const {
-    callback.Run(DBUS_METHOD_CALL_SUCCESS, properties_);
+    scoped_ptr<base::DictionaryValue> properties_copy(properties_.DeepCopy());
+    callback.Run(DBUS_METHOD_CALL_SUCCESS, properties_copy.Pass());
   }
 
   base::DictionaryValue properties_;
 
   // Note: This should remain the last member so it'll be destroyed and
   // invalidate its weak pointers before any other members are destroyed.
   base::WeakPtrFactory<ShillIPConfigClientStubImpl> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(ShillIPConfigClientStubImpl);
 };
 
 }  // namespace
 
 ShillIPConfigClient::ShillIPConfigClient() {}
 
 ShillIPConfigClient::~ShillIPConfigClient() {}
 
 // static
 ShillIPConfigClient* ShillIPConfigClient::Create(
     DBusClientImplementationType type,
     dbus::Bus* bus) {
   if (type == REAL_DBUS_CLIENT_IMPLEMENTATION)
     return new ShillIPConfigClientImpl(bus);
   DCHECK_EQ(STUB_DBUS_CLIENT_IMPLEMENTATION, type);
   return new ShillIPConfigClientStubImpl();
 }
 
 }  // namespace chromeos