IPC: Delete thread-safe send support

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 55 matching lines @@
 
   ~ChannelMojo() override;
 
   // Channel implementation
   bool Connect() override;
   void Pause() override;
   void Unpause(bool flush) override;
   void Flush() override;
   void Close() override;
   bool Send(Message* message) override;
-  bool IsSendThreadSafe() const override;
   base::ProcessId GetPeerPID() const override;
   base::ProcessId GetSelfPID() const override;
   Channel::AssociatedInterfaceSupport* GetAssociatedInterfaceSupport() override;
 
 #if defined(OS_POSIX) && !defined(OS_NACL_SFI)
   int GetClientFileDescriptor() const override;
   base::ScopedFD TakeClientFileDescriptor() override;
 #endif  // defined(OS_POSIX) && !defined(OS_NACL_SFI)
 
   // These access protected API of IPC::Message, which has ChannelMojo
@@ skipping 47 matching lines @@
       associated_interfaces_;
 
   base::WeakPtrFactory<ChannelMojo> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(ChannelMojo);
 };
 
 }  // namespace IPC
 
 #endif  // IPC_IPC_CHANNEL_MOJO_H_