Refactoring AudioDirectiveHandler to support testing

components/copresence/handlers/audio/audio_directive_list_unittest.cc

 // Copyright 2014 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 "components/copresence/handlers/audio/audio_directive_list.h"
 
 #include "base/bind.h"
 #include "base/bind_helpers.h"
 #include "base/message_loop/message_loop.h"
 #include "testing/gmock/include/gmock/gmock.h"
 
 using testing::IsNull;
 
 namespace copresence {
 
 class AudioDirectiveListTest : public testing::Test {
  public:
-  AudioDirectiveListTest() : directive_list_(new AudioDirectiveList()) {}
-
-  ~AudioDirectiveListTest() override {}
+  AudioDirectiveListTest() : directive_list_(new AudioDirectiveList) {}
 
  protected:
   base::MessageLoop message_loop_;
   scoped_ptr<AudioDirectiveList> directive_list_;
 };
 
 TEST_F(AudioDirectiveListTest, Basic) {
   const base::TimeDelta kTtl = base::TimeDelta::FromSeconds(9999);
 
   EXPECT_THAT(directive_list_->GetActiveDirective(), IsNull());
@@ skipping 42 matching lines @@
   directive_list_->RemoveDirective("op_id3");
   directive_list_->RemoveDirective("op_id3");
   EXPECT_EQ("op_id2", directive_list_->GetActiveDirective()->op_id);
   directive_list_->RemoveDirective("op_id2");
   EXPECT_EQ("op_id1", directive_list_->GetActiveDirective()->op_id);
   directive_list_->RemoveDirective("op_id1");
   EXPECT_THAT(directive_list_->GetActiveDirective(), IsNull());
 }
 
 }  // namespace copresence