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

content/utility/utility_thread_impl.h

Index: content/utility/utility_thread_impl.h
===================================================================
--- content/utility/utility_thread_impl.h	(revision 163080)
+++ content/utility/utility_thread_impl.h	(working copy)
@@ -18,10 +18,9 @@
 
 namespace content {
 class WebKitPlatformSupportImpl;
-}
 
 // This class represents the background thread where the utility task runs.
-class UtilityThreadImpl : public content::UtilityThread,
+class UtilityThreadImpl : public UtilityThread,
                           public ChildThread {
  public:
   UtilityThreadImpl();
@@ -49,9 +48,11 @@
   // True when we're running in batch mode.
   bool batch_mode_;
 
-  scoped_ptr<content::WebKitPlatformSupportImpl> webkit_platform_support_;
+  scoped_ptr<WebKitPlatformSupportImpl> webkit_platform_support_;
 
   DISALLOW_COPY_AND_ASSIGN(UtilityThreadImpl);
 };
 
+}  // namespace content
+
 #endif  // CONTENT_UTILITY_UTILITY_THREAD_IMPL_H_