Move content's a plugin, ppapi_plugin, utility, and worker subdirectories to the content namespace.

content/ppapi_plugin/ppapi_broker_main.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 "base/message_loop.h"
 #include "base/threading/platform_thread.h"
 #include "build/build_config.h"
 #include "content/common/child_process.h"
 #include "content/ppapi_plugin/ppapi_thread.h"
 #include "content/public/common/content_switches.h"
 #include "content/public/common/main_function_params.h"
 
+namespace content {
+
 // Main function for starting the PPAPI broker process.
-int PpapiBrokerMain(const content::MainFunctionParams& parameters) {
+int PpapiBrokerMain(const MainFunctionParams& parameters) {
   const CommandLine& command_line = parameters.command_line;
   if (command_line.HasSwitch(switches::kPpapiStartupDialog)) {
     ChildProcess::WaitForDebugger("PpapiBroker");
   }
 
   MessageLoop main_message_loop(MessageLoop::TYPE_DEFAULT);
   base::PlatformThread::SetName("CrPPAPIBrokerMain");
 
   ChildProcess ppapi_broker_process;
   ppapi_broker_process.set_main_thread(
       new PpapiThread(parameters.command_line, true));  // Broker.
 
   main_message_loop.Run();
   DVLOG(1) << "PpapiBrokerMain exiting";
   return 0;
 }
+
+}  // namespace content