Move NPAPI test plugin to content/test/plugin.

content/test/plugin/plugin_create_instance_in_paint.cc

Index: content/test/plugin/plugin_create_instance_in_paint.cc
===================================================================
--- content/test/plugin/plugin_create_instance_in_paint.cc	(revision 0)
+++ content/test/plugin/plugin_create_instance_in_paint.cc	(working copy)
@@ -2,10 +2,10 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#include "webkit/plugins/npapi/test/plugin_create_instance_in_paint.h"
+#include "content/test/plugin/plugin_create_instance_in_paint.h"
 
 #include "base/logging.h"
-#include "webkit/plugins/npapi/test/plugin_client.h"
+#include "content/test/plugin/plugin_client.h"
 
 namespace NPAPIClient {