Move the remaning files in content\common to the content namespace.

content/common/npobject_util.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.
 //
 // Helper functions that are used by the NPObject proxy and stub.
 
 #ifndef CONTENT_COMMON_NPOBJECT_UTIL_H_
 #define CONTENT_COMMON_NPOBJECT_UTIL_H_
 
 #include "build/build_config.h"
 
 #if defined(OS_WIN)
 #include <windows.h>
 #endif
 
 #include "content/common/npobject_stub.h"
 
 class GURL;
-class NPChannelBase;
 
 struct _NPVariant;
-struct NPIdentifier_Param;
-struct NPVariant_Param;
 
 typedef _NPVariant NPVariant;
 typedef void *NPIdentifier;
 
+namespace content {
+class NPChannelBase;
+struct NPIdentifier_Param;
+struct NPVariant_Param;
+
 // Needs to be called early in the plugin process lifetime, before any
 // plugin instances are initialized.
 void PatchNPNFunctions();
 
 // Returns true if the current process is a plugin process, or false otherwise.
 bool IsPluginProcess();
 
 // Creates an object similar to NPIdentifier that can be marshalled.
 void CreateNPIdentifierParam(NPIdentifier id, NPIdentifier_Param* param);
 
@@ skipping 22 matching lines @@
 
 #if defined(OS_WIN)
 // Given a plugin's HWND, returns an event associated with the WebContentsImpl
 // that's set when inside a messagebox.  This tells the plugin process that
 // the message queue should be pumped (as what would happen if everything was
 // in-process).  This avoids deadlocks when a plugin invokes javascript that
 // causes a message box to come up.
 HANDLE GetMessageBoxEvent(HWND hwnd);
 #endif  // defined(OS_WIN)
 
+}  // namespace content
+
 #endif  // CONTENT_COMMON_NPOBJECT_UTIL_H_