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

content/ppapi_plugin/ppapi_plugin_main.cc

Index: content/ppapi_plugin/ppapi_plugin_main.cc
===================================================================
--- content/ppapi_plugin/ppapi_plugin_main.cc	(revision 163080)
+++ content/ppapi_plugin/ppapi_plugin_main.cc	(working copy)
@@ -33,8 +33,10 @@
 void* g_target_services = 0;
 #endif
 
+namespace content {
+
 // Main function for starting the PPAPI plugin process.
-int PpapiPluginMain(const content::MainFunctionParams& parameters) {
+int PpapiPluginMain(const MainFunctionParams& parameters) {
   const CommandLine& command_line = parameters.command_line;
 
 #if defined(OS_WIN)
@@ -77,7 +79,7 @@
   base::PlatformThread::SetName("CrPPAPIMain");
 
 #if defined(OS_LINUX)
-  content::InitializeSandbox();
+  InitializeSandbox();
 #endif
 
   ChildProcess ppapi_process;
@@ -87,3 +89,5 @@
   main_message_loop.Run();
   return 0;
 }
+
+}  // namespace content