[cast_channel] Make CastSocket not inherit from ApiResource

extensions/browser/api/cast_channel/cast_test_util.h

 // 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.
 
 #ifndef EXTENSIONS_BROWSER_API_CAST_CHANNEL_CAST_TEST_UTIL_H_
 #define EXTENSIONS_BROWSER_API_CAST_CHANNEL_CAST_TEST_UTIL_H_
 
 #include <string>
 #include <utility>
 
@@ skipping 74 matching lines @@
   MOCK_CONST_METHOD0(ready_state, ReadyState());
   MOCK_CONST_METHOD0(error_state, ChannelError());
   MOCK_CONST_METHOD0(keep_alive, bool(void));
   MOCK_CONST_METHOD0(audio_only, bool(void));
   MOCK_METHOD1(SetErrorState, void(ChannelError error_state));
 
   CastTransport* transport() const override { return mock_transport_.get(); }
 
   MockCastTransport* mock_transport() const { return mock_transport_.get(); }
 
+  const std::string& owner_extension_id() const override;
+
  private:
   std::unique_ptr<MockCastTransport> mock_transport_;
   std::unique_ptr<CastTransport::Delegate> delegate_;
+  std::string owner_extension_id_;
 
   DISALLOW_COPY_AND_ASSIGN(MockCastSocket);
 };
 
 // Creates the IPEndpoint 192.168.1.1.
 net::IPEndPoint CreateIPEndPointForTest();
 
 // Checks if two proto messages are the same.
 // From
 // third_party/cacheinvalidation/overrides/google/cacheinvalidation/deps/gmock.h
@@ skipping 10 matching lines @@
                 AND_1_VALUE_PARAMS(rv)) {
   base::ThreadTaskRunnerHandle::Get()->PostTask(
       FROM_HERE, base::Bind(testing::get<cb_idx>(args), rv));
 }
 
 }  // namespace cast_channel
 }  // namespace api
 }  // namespace extensions
 
 #endif  // EXTENSIONS_BROWSER_API_CAST_CHANNEL_CAST_TEST_UTIL_H_