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

content/worker/worker_webapplicationcachehost_impl.h

Index: content/worker/worker_webapplicationcachehost_impl.h
===================================================================
--- content/worker/worker_webapplicationcachehost_impl.h	(revision 163080)
+++ content/worker/worker_webapplicationcachehost_impl.h	(working copy)
@@ -7,6 +7,8 @@
 
 #include "webkit/appcache/web_application_cache_host_impl.h"
 
+namespace content {
+
 // Information used to construct and initialize an appcache host
 // for a worker.
 struct WorkerAppCacheInitInfo {
@@ -48,4 +50,6 @@
   virtual bool selectCacheWithManifest(const WebKit::WebURL& manifestURL);
 };
 
+}  // namespace content
+
 #endif  // CHROME_WORKER_WORKER_WEBAPPLICATIONCACHEHOST_IMPL_H_