Use a direct include of strings headers in webkit/, part 2.

webkit/plugins/npapi/plugin_utils.h

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef WEBKIT_PLUGINS_NPAPI_PLUGIN_UTILS_H_
 #define WEBKIT_PLUGINS_NPAPI_PLUGIN_UTILS_H_
 
-#include "base/string16.h"
+#include "base/strings/string16.h"
 
 namespace base {
 class Version;
 }
 
 namespace webkit {
 namespace npapi {
 
 // Parse a version string as used by a plug-in. This method is more lenient
 // in accepting weird version strings than base::Version::GetFromString()
@@ skipping 10 matching lines @@
 
 // Returns true if the plugin thread should terminate the process forcefully
 // instead of exiting cleanly.
 bool ShouldForcefullyTerminatePluginProcess();
 
 
 }  // namespace npapi
 }  // namespace webkit
 
 #endif  // WEBKIT_PLUGINS_NPAPI_PLUGIN_UTILS_H_