Mojo C++ bindings: remove usage of AssociatedGroup from ipc/

ipc/ipc_channel_mojo.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 IPC_IPC_CHANNEL_MOJO_H_
 #define IPC_IPC_CHANNEL_MOJO_H_
 
 #include <stdint.h>
 
 #include <map>
@@ skipping 88 matching lines @@
       Mode mode,
       Listener* listener,
       const scoped_refptr<base::SingleThreadTaskRunner>& ipc_task_runner);
 
   void ForwardMessageFromThreadSafePtr(mojo::Message message);
   void ForwardMessageWithResponderFromThreadSafePtr(
       mojo::Message message,
       std::unique_ptr<mojo::MessageReceiver> responder);
 
   // Channel::AssociatedInterfaceSupport:
-  mojo::AssociatedGroup* GetAssociatedGroup() override;
   std::unique_ptr<mojo::ThreadSafeForwarder<mojom::Channel>>
   CreateThreadSafeChannel() override;
   void AddGenericAssociatedInterface(
       const std::string& name,
       const GenericAssociatedInterfaceFactory& factory) override;
   void GetGenericRemoteAssociatedInterface(
       const std::string& name,
       mojo::ScopedInterfaceEndpointHandle handle) override;
 
   // A TaskRunner which runs tasks on the ChannelMojo's owning thread.
@@ skipping 10 matching lines @@
       associated_interfaces_;
 
   base::WeakPtrFactory<ChannelMojo> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(ChannelMojo);
 };
 
 }  // namespace IPC
 
 #endif  // IPC_IPC_CHANNEL_MOJO_H_