Revert of Deletes mojo::Callback

net/proxy/proxy_resolver_factory_mojo.cc

 // Copyright 2015 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 "net/proxy/proxy_resolver_factory_mojo.h"
 
 #include <set>
 #include <utility>
 
 #include "base/bind.h"
-#include "base/callback.h"
 #include "base/logging.h"
 #include "base/macros.h"
 #include "base/stl_util.h"
 #include "base/threading/thread_checker.h"
 #include "base/values.h"
 #include "mojo/common/common_type_converters.h"
 #include "mojo/common/url_type_converters.h"
 #include "mojo/public/cpp/bindings/binding.h"
 #include "net/base/load_states.h"
 #include "net/base/net_errors.h"
@@ skipping 325 matching lines @@
                    base::Unretained(this)));
     binding_.set_connection_error_handler(
         base::Bind(&ProxyResolverFactoryMojo::Job::OnConnectionError,
                    base::Unretained(this)));
   }
 
   void OnConnectionError() { ReportResult(ERR_PAC_SCRIPT_TERMINATED); }
 
  private:
   void ReportResult(int32_t error) override {
-    resolver_ptr_.set_connection_error_handler(base::Closure());
-    binding_.set_connection_error_handler(base::Closure());
+    resolver_ptr_.set_connection_error_handler(mojo::Closure());
+    binding_.set_connection_error_handler(mojo::Closure());
     if (error == OK) {
       resolver_->reset(new ProxyResolverMojo(
           std::move(resolver_ptr_), factory_->host_resolver_,
           std::move(on_delete_callback_runner_), std::move(error_observer_),
           factory_->net_log_));
     }
     on_delete_callback_runner_.reset();
     callback_.Run(error);
   }
 
@@ skipping 32 matching lines @@
     return ERR_PAC_SCRIPT_FAILED;
   }
   request->reset(new Job(this, pac_script, resolver, callback,
                          error_observer_factory_.is_null()
                              ? nullptr
                              : error_observer_factory_.Run()));
   return ERR_IO_PENDING;
 }
 
 }  // namespace net