Move Pickle to base namespace.

content/child/plugin_param_traits.h

Index: content/child/plugin_param_traits.h
diff --git a/content/child/plugin_param_traits.h b/content/child/plugin_param_traits.h
index a83ae1021635ce8b88395ede497c848615211549..03628c92519279887c74a3a6017ec63bdb757154 100644
--- a/content/child/plugin_param_traits.h
+++ b/content/child/plugin_param_traits.h
@@ -70,7 +70,7 @@ template <>
 struct ParamTraits<content::NPVariant_Param> {
   typedef content::NPVariant_Param param_type;
   static void Write(Message* m, const param_type& p);
-  static bool Read(const Message* m, PickleIterator* iter, param_type* r);
+  static bool Read(const Message* m, base::PickleIterator* iter, param_type* r);
   static void Log(const param_type& p, std::string* l);
 };
 
@@ -78,7 +78,7 @@ template <>
 struct ParamTraits<content::NPIdentifier_Param> {
   typedef content::NPIdentifier_Param param_type;
   static void Write(Message* m, const param_type& p);
-  static bool Read(const Message* m, PickleIterator* iter, param_type* r);
+  static bool Read(const Message* m, base::PickleIterator* iter, param_type* r);
   static void Log(const param_type& p, std::string* l);
 };