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

content/ppapi_plugin/plugin_process_dispatcher.cc

Index: content/ppapi_plugin/plugin_process_dispatcher.cc
===================================================================
--- content/ppapi_plugin/plugin_process_dispatcher.cc	(revision 163080)
+++ content/ppapi_plugin/plugin_process_dispatcher.cc	(working copy)
@@ -8,6 +8,7 @@
 #include "base/bind_helpers.h"
 #include "content/common/child_process.h"
 
+namespace content {
 namespace {
 
 // How long we wait before releasing the plugin process.
@@ -37,3 +38,5 @@
                  base::Unretained(ChildProcess::current())),
       base::TimeDelta::FromSeconds(kPluginReleaseTimeSeconds));
 }
+
+}  // namespace content