[CRD iOS] Fix the leaky RemotingClient

remoting/ios/session/remoting_client_session_delegate.h

 // Copyright 2017 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 REMOTING_IOS_SESSION_REMOTING_CLIENT_SESSION_DELEGATE_H_
 #define REMOTING_IOS_SESSION_REMOTING_CLIENT_SESSION_DELEGATE_H_
 
 #include "base/macros.h"
 #include "base/memory/weak_ptr.h"
 #include "remoting/client/chromoting_session.h"
@@ skipping 21 matching lines @@
                             const std::string& client_id,
                             const std::string& scope) override;
   void SetCapabilities(const std::string& capabilities) override;
   void HandleExtensionMessage(const std::string& type,
                               const std::string& message) override;
 
   base::WeakPtr<RemotingClientSessonDelegate> GetWeakPtr();
 
  private:
   ChromotingClientRuntime* runtime_;
-  id client_;
+  __weak id client_;
 
   base::WeakPtrFactory<RemotingClientSessonDelegate> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(RemotingClientSessonDelegate);
 };
 
 }  // namespace remoting
 
 #endif  // REMOTING_IOS_SESSION_REMOTING_CLIENT_SESSION_DELEGATE_H_