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

content/ppapi_plugin/plugin_process_dispatcher.h

Index: content/ppapi_plugin/plugin_process_dispatcher.h
===================================================================
--- content/ppapi_plugin/plugin_process_dispatcher.h	(revision 163080)
+++ content/ppapi_plugin/plugin_process_dispatcher.h	(working copy)
@@ -8,6 +8,8 @@
 #include "base/basictypes.h"
 #include "ppapi/proxy/plugin_dispatcher.h"
 
+namespace content {
+
 // Wrapper around a PluginDispatcher that provides the necessary integration
 // for plugin process management. This class is to avoid direct dependencies
 // from the PPAPI proxy on the Chrome multiprocess infrastructure.
@@ -22,4 +24,6 @@
   DISALLOW_COPY_AND_ASSIGN(PluginProcessDispatcher);
 };
 
+}  // namespace content
+
 #endif  // CONTENT_PPAPI_PLUGIN_PLUGIN_PROCESS_DISPATCHER_H_