Add a Content API around BrowserChildProcessHost, similar to what was done with ChildProcessHost....

chrome/browser/nacl_host/nacl_broker_host_win.cc

 // Copyright (c) 2011 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 "chrome/browser/nacl_host/nacl_broker_host_win.h"
 
 #include "base/command_line.h"
 #include "base/path_service.h"
 #include "ipc/ipc_switches.h"
 #include "chrome/browser/nacl_host/nacl_broker_service_win.h"
 #include "chrome/browser/nacl_host/nacl_process_host.h"
 #include "chrome/common/chrome_constants.h"
 #include "chrome/common/chrome_switches.h"
 #include "chrome/common/logging_chrome.h"
 #include "chrome/common/nacl_cmd_line.h"
 #include "chrome/common/nacl_messages.h"
+#include "content/public/browser/browser_child_process_host.h"
 #include "content/public/common/child_process_host.h"
 
 NaClBrokerHost::NaClBrokerHost()
-    : BrowserChildProcessHost(content::PROCESS_TYPE_NACL_BROKER),
-      stopping_(false) {
+    : stopping_(false) {
+  process_.reset(content::BrowserChildProcessHost::Create(
+      content::PROCESS_TYPE_NACL_BROKER, this));
 }
 
 NaClBrokerHost::~NaClBrokerHost() {
 }
 
 bool NaClBrokerHost::Init() {
   // Create the channel that will be used for communicating with the broker.
-  std::string channel_id = child_process_host()->CreateChannel();
+  std::string channel_id = process_->GetHost()->CreateChannel();
   if (channel_id.empty())
     return false;
 
   // Create the path to the nacl broker/loader executable.
   FilePath module_path;
   if (!PathService::Get(base::FILE_MODULE, &module_path))
     return false;
 
   FilePath nacl_path = module_path.DirName().Append(chrome::kNaClAppName);
   CommandLine* cmd_line = new CommandLine(nacl_path);
   nacl::CopyNaClCommandLineArguments(cmd_line);
 
   cmd_line->AppendSwitchASCII(switches::kProcessType,
                               switches::kNaClBrokerProcess);
   cmd_line->AppendSwitchASCII(switches::kProcessChannelID, channel_id);
   if (logging::DialogsAreSuppressed())
     cmd_line->AppendSwitch(switches::kNoErrorDialogs);
 
-  BrowserChildProcessHost::Launch(FilePath(), cmd_line);
+  process_->Launch(FilePath(), cmd_line);
   return true;
 }
 
 bool NaClBrokerHost::OnMessageReceived(const IPC::Message& msg) {
   bool handled = true;
   IPC_BEGIN_MESSAGE_MAP(NaClBrokerHost, msg)
     IPC_MESSAGE_HANDLER(NaClProcessMsg_LoaderLaunched, OnLoaderLaunched)
     IPC_MESSAGE_UNHANDLED(handled = false)
   IPC_END_MESSAGE_MAP()
   return handled;
 }
 
 bool NaClBrokerHost::LaunchLoader(
     const std::wstring& loader_channel_id) {
-  return Send(new NaClProcessMsg_LaunchLoaderThroughBroker(loader_channel_id));
+  return process_->Send(
+      new NaClProcessMsg_LaunchLoaderThroughBroker(loader_channel_id));
 }
 
 void NaClBrokerHost::OnLoaderLaunched(const std::wstring& loader_channel_id,
                                       base::ProcessHandle handle) {
   NaClBrokerService::GetInstance()->OnLoaderLaunched(loader_channel_id, handle);
 }
 
 void NaClBrokerHost::StopBroker() {
   stopping_ = true;
-  Send(new NaClProcessMsg_StopBroker());
+  process_->Send(new NaClProcessMsg_StopBroker());
 }