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

content/worker/worker_webkitplatformsupport_impl.cc

Index: content/worker/worker_webkitplatformsupport_impl.cc
===================================================================
--- content/worker/worker_webkitplatformsupport_impl.cc	(revision 163080)
+++ content/worker/worker_webkitplatformsupport_impl.cc	(working copy)
@@ -38,6 +38,8 @@
 using WebKit::WebString;
 using WebKit::WebURL;
 
+namespace content {
+
 // TODO(kinuko): Probably this could be consolidated into
 // RendererWebKitPlatformSupportImpl::FileUtilities.
 class WorkerWebKitPlatformSupportImpl::FileUtilities
@@ -284,3 +286,5 @@
     blob_registry_.reset(new WebBlobRegistryImpl(WorkerThread::current()));
   return blob_registry_.get();
 }
+
+}  // namespace content