Always use ChannelMojo for content child processes.

content/common/child_process_host_impl.cc

 // Copyright (c) 2012 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 "content/common/child_process_host_impl.h"
 
 #include <limits>
 
 #include "base/atomic_sequence_num.h"
 #include "base/command_line.h"
@@ skipping 155 matching lines @@
   IPC::mojom::ChannelBootstrapPtr bootstrap;
   remote_interfaces->GetInterface(&bootstrap);
   channel_ = IPC::ChannelMojo::Create(bootstrap.PassInterface().PassHandle(),
                                       IPC::Channel::MODE_SERVER, this);
   DCHECK(channel_);
 
   bool initialized = InitChannel();
   DCHECK(initialized);
 }
 
-std::string ChildProcessHostImpl::CreateChannel() {
-  DCHECK(channel_id_.empty());
-  channel_id_ = IPC::Channel::GenerateVerifiedChannelID(std::string());
-  channel_ = IPC::Channel::CreateServer(channel_id_, this);
-  if (!channel_ || !InitChannel())
-    return std::string();
-
-  return channel_id_;
-}
-
 bool ChildProcessHostImpl::InitChannel() {
 #if USE_ATTACHMENT_BROKER
   DCHECK(base::MessageLoopForIO::IsCurrent());
   IPC::AttachmentBroker::GetGlobal()->RegisterCommunicationChannel(
       channel_.get(), base::ThreadTaskRunnerHandle::Get());
 #endif
   if (!channel_->Connect()) {
 #if USE_ATTACHMENT_BROKER
     IPC::AttachmentBroker::GetGlobal()->DeregisterCommunicationChannel(
         channel_.get());
@@ skipping 185 matching lines @@
 }
 
 void ChildProcessHostImpl::OnDeletedGpuMemoryBuffer(
     gfx::GpuMemoryBufferId id,
     const gpu::SyncToken& sync_token) {
   // Note: Nothing to do here as ownership of shared memory backed
   // GpuMemoryBuffers is passed with IPC.
 }
 
 }  // namespace content