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

content/worker/websharedworker_stub.cc

Index: content/worker/websharedworker_stub.cc
===================================================================
--- content/worker/websharedworker_stub.cc	(revision 163080)
+++ content/worker/websharedworker_stub.cc	(working copy)
@@ -16,6 +16,8 @@
 #include "third_party/WebKit/Source/WebKit/chromium/public/platform/WebString.h"
 #include "third_party/WebKit/Source/WebKit/chromium/public/platform/WebURL.h"
 
+namespace content {
+
 WebSharedWorkerStub::WebSharedWorkerStub(
     const string16& name, int route_id,
     const WorkerAppCacheInitInfo& appcache_init_info)
@@ -125,3 +127,5 @@
   EnsureWorkerContextTerminates();
   started_ = false;
 }
+
+}  // namespace content