Refactor Pickle Read methods to use higher performance PickleIterator.

content/common/indexed_db/indexed_db_param_traits.h

Index: content/common/indexed_db/indexed_db_param_traits.h
diff --git a/content/common/indexed_db/indexed_db_param_traits.h b/content/common/indexed_db/indexed_db_param_traits.h
index 930ed0b04ce38bcf8304918ec7d3f7d5e0833dba..3dfd5b84857dab564b68cf59fbb67bd16c48d5d9 100644
--- a/content/common/indexed_db/indexed_db_param_traits.h
+++ b/content/common/indexed_db/indexed_db_param_traits.h
@@ -27,7 +27,7 @@ template <>
 struct ParamTraits<content::SerializedScriptValue> {
   typedef content::SerializedScriptValue param_type;
   static void Write(Message* m, const param_type& p);
-  static bool Read(const Message* m, void** iter, param_type* r);
+  static bool Read(const Message* m, PickleIterator* iter, param_type* r);
   static void Log(const param_type& p, std::string* l);
 };
 
@@ -35,7 +35,7 @@ template <>
 struct ParamTraits<IndexedDBKey> {
   typedef IndexedDBKey param_type;
   static void Write(Message* m, const param_type& p);
-  static bool Read(const Message* m, void** iter, param_type* r);
+  static bool Read(const Message* m, PickleIterator* iter, param_type* r);
   static void Log(const param_type& p, std::string* l);
 };
 
@@ -43,7 +43,7 @@ template <>
 struct ParamTraits<IndexedDBKeyRange> {
   typedef IndexedDBKeyRange param_type;
   static void Write(Message* m, const param_type& p);
-  static bool Read(const Message* m, void** iter, param_type* r);
+  static bool Read(const Message* m, PickleIterator* iter, param_type* r);
   static void Log(const param_type& p, std::string* l);
 };