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

content/ppapi_plugin/ppapi_broker_main.cc

Index: content/ppapi_plugin/ppapi_broker_main.cc
===================================================================
--- content/ppapi_plugin/ppapi_broker_main.cc	(revision 163080)
+++ content/ppapi_plugin/ppapi_broker_main.cc	(working copy)
@@ -10,8 +10,10 @@
 #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");
@@ -28,3 +30,5 @@
   DVLOG(1) << "PpapiBrokerMain exiting";
   return 0;
 }
+
+}  // namespace content