[cast_channel] Make CastSocket not inherit from ApiResource

extensions/browser/api/cast_channel/cast_test_util.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 "extensions/browser/api/cast_channel/cast_test_util.h"
 
 #include <utility>
 
 #include "net/base/ip_address.h"
 
@@ skipping 17 matching lines @@
     std::unique_ptr<CastTransport::Delegate> delegate) {
   delegate_ = std::move(delegate);
 }
 
 MockCastTransportDelegate::MockCastTransportDelegate() {
 }
 MockCastTransportDelegate::~MockCastTransportDelegate() {
 }
 
 MockCastSocket::MockCastSocket()
-    : CastSocket(kTestExtensionId), mock_transport_(new MockCastTransport) {
+    : mock_transport_(new MockCastTransport),
+      owner_extension_id_(kTestExtensionId) {}
+MockCastSocket::~MockCastSocket() {
 }
-MockCastSocket::~MockCastSocket() {
+
+const std::string& MockCastSocket::owner_extension_id() const {
+  return owner_extension_id_;
 }
 
 net::IPEndPoint CreateIPEndPointForTest() {
   return net::IPEndPoint(net::IPAddress(192, 168, 1, 1), 8009);
 }
 
 }  // namespace cast_channel
 }  // namespace api
 }  // namespace extensions