Make ChildProcessHost be used through an interface in content/public, instead of by inheritence.

content/browser/utility_process_host.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 "content/browser/utility_process_host.h"
 
 #include "base/bind.h"
 #include "base/bind_helpers.h"
 #include "base/command_line.h"
 #include "base/message_loop.h"
 #include "base/utf_string_conversions.h"
-#include "content/common/child_process_host.h"
+#include "content/common/child_process_host_impl.h"
 #include "content/common/utility_messages.h"
 #include "content/public/browser/content_browser_client.h"
 #include "content/public/common/content_switches.h"
 #include "ipc/ipc_switches.h"
 #include "ui/base/ui_base_switches.h"
 #include "webkit/plugins/plugin_switches.h"
 
 using content::BrowserThread;
+using content::ChildProcessHost;
 
 UtilityProcessHost::Client::Client() {
 }
 
 UtilityProcessHost::Client::~Client() {
 }
 
 void UtilityProcessHost::Client::OnProcessCrashed(int exit_code) {
 }
 
@@ skipping 49 matching lines @@
   if (started_)
     return true;
   started_ = true;
 
   if (is_batch_mode_)
     return true;
   // Name must be set or metrics_service will crash in any test which
   // launches a UtilityProcessHost.
   set_name(ASCIIToUTF16("utility process"));
 
-  if (!child_process_host()->CreateChannel())
+  std::string channel_id = child_process_host()->CreateChannel();
+  if (channel_id.empty())
     return false;
 
   FilePath exe_path = GetUtilityProcessCmd();
   if (exe_path.empty()) {
     NOTREACHED() << "Unable to get utility process binary name.";
     return false;
   }
 
   CommandLine* cmd_line = new CommandLine(exe_path);
   cmd_line->AppendSwitchASCII(switches::kProcessType,
                               switches::kUtilityProcess);
-  cmd_line->AppendSwitchASCII(switches::kProcessChannelID,
-                              child_process_host()->channel_id());
+  cmd_line->AppendSwitchASCII(switches::kProcessChannelID, channel_id);
   std::string locale =
       content::GetContentClient()->browser()->GetApplicationLocale();
   cmd_line->AppendSwitchASCII(switches::kLang, locale);
 
   const CommandLine& browser_command_line = *CommandLine::ForCurrentProcess();
   if (browser_command_line.HasSwitch(switches::kChromeFrame))
     cmd_line->AppendSwitch(switches::kChromeFrame);
   if (no_sandbox_ || browser_command_line.HasSwitch(switches::kNoSandbox))
     cmd_line->AppendSwitch(switches::kNoSandbox);
   if (browser_command_line.HasSwitch(switches::kDebugPluginLoading))
@@ skipping 32 matching lines @@
       base::IgnoreReturn<bool>(
           base::Bind(&Client::OnMessageReceived, client_.get(), message)));
   return true;
 }
 
 void UtilityProcessHost::OnProcessCrashed(int exit_code) {
   BrowserThread::PostTask(
       client_thread_id_, FROM_HERE,
       base::Bind(&Client::OnProcessCrashed, client_.get(), exit_code));
 }