IPC: Delete thread-safe send support

ipc/ipc_channel_mojo.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 "ipc/ipc_channel_mojo.h"
 
 #include <stddef.h>
 #include <stdint.h>
 
 #include <memory>
@@ skipping 352 matching lines @@
   // this object, and that would be bad if we are called from Send(). Instead,
   // we return false and hope the caller will close the pipe. If they do not,
   // the pipe will still be closed next time OnFileCanReadWithoutBlocking is
   // called.
   //
   // With Mojo, there's no OnFileCanReadWithoutBlocking, but we expect the
   // pipe's connection error handler will be invoked in its place.
   return message_reader_->Send(std::move(scoped_message));
 }
 
-bool ChannelMojo::IsSendThreadSafe() const {
-  return false;
-}
-
 base::ProcessId ChannelMojo::GetPeerPID() const {
   if (!message_reader_)
     return base::kNullProcessId;
   return message_reader_->GetPeerPid();
 }
 
 base::ProcessId ChannelMojo::GetSelfPID() const {
 #if defined(OS_LINUX)
   if (int global_pid = GetGlobalPid())
     return global_pid;
@@ skipping 110 matching lines @@
 }
 
 void ChannelMojo::GetGenericRemoteAssociatedInterface(
     const std::string& name,
     mojo::ScopedInterfaceEndpointHandle handle) {
   if (message_reader_)
     message_reader_->GetRemoteInterface(name, std::move(handle));
 }
 
 }  // namespace IPC