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

content/common/npobject_util.h

Index: content/common/npobject_util.h
===================================================================
--- content/common/npobject_util.h	(revision 163632)
+++ content/common/npobject_util.h	(working copy)
@@ -16,15 +16,17 @@
 #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();
@@ -67,4 +69,6 @@
 HANDLE GetMessageBoxEvent(HWND hwnd);
 #endif  // defined(OS_WIN)
 
+}  // namespace content
+
 #endif  // CONTENT_COMMON_NPOBJECT_UTIL_H_