Remove unused using declarations from unit-test.

blimp/net/blimp_message_checkpointer_unittest.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 "blimp/net/blimp_message_checkpointer.h"
 
 #include "base/memory/ref_counted.h"
 #include "base/test/test_mock_time_task_runner.h"
 #include "base/thread_task_runner_handle.h"
 #include "blimp/net/test_common.h"
 #include "net/base/net_errors.h"
 #include "net/base/test_completion_callback.h"
 #include "testing/gmock/include/gmock/gmock.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 using testing::_;
-using testing::InvokeArgument;
-using testing::Return;
 using testing::SaveArg;
 
 namespace blimp {
 
 static scoped_ptr<BlimpMessage> CreateExpectedAckMessage(int64 id) {
   scoped_ptr<BlimpMessage> message = make_scoped_ptr(new BlimpMessage);
   message->set_type(BlimpMessage::PROTOCOL_CONTROL);
   ProtocolControlMessage* protocol_control =
       message->mutable_protocol_control();
   protocol_control->set_type(ProtocolControlMessage::CHECKPOINT_ACK);
@@ skipping 119 matching lines @@
   captured_cb_.Run(net::OK);
   runner_->FastForwardBy(base::TimeDelta::FromSeconds(2));
 
   // And do it again to verify we get a fresh ACK.
   SimulateIncomingMessage();
   captured_cb_.Run(net::OK);
   runner_->FastForwardBy(base::TimeDelta::FromSeconds(2));
 }
 
 }  // namespace blimp