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

content/worker/worker_webkitplatformsupport_impl.h

Index: content/worker/worker_webkitplatformsupport_impl.h
===================================================================
--- content/worker/worker_webkitplatformsupport_impl.h	(revision 163080)
+++ content/worker/worker_webkitplatformsupport_impl.h	(working copy)
@@ -15,9 +15,10 @@
 class WebFileUtilities;
 }
 
-class WorkerWebKitPlatformSupportImpl
-    : public content::WebKitPlatformSupportImpl,
-      public WebKit::WebMimeRegistry {
+namespace content {
+
+class WorkerWebKitPlatformSupportImpl : public WebKitPlatformSupportImpl,
+                                        public WebKit::WebMimeRegistry {
  public:
   WorkerWebKitPlatformSupportImpl();
   virtual ~WorkerWebKitPlatformSupportImpl();
@@ -98,4 +99,6 @@
   scoped_ptr<WebKit::WebIDBFactory> web_idb_factory_;
 };
 
+}  // namespace content
+
 #endif  // CONTENT_WORKER_WORKER_WEBKITPLATFORMSUPPORT_IMPL_H_