Move Pickle to base namespace.

content/common/mac/attributed_string_coder.h

Index: content/common/mac/attributed_string_coder.h
diff --git a/content/common/mac/attributed_string_coder.h b/content/common/mac/attributed_string_coder.h
index 35b3bf54a55403009bc2ff18ebc894235be96acf..971088e856fd7c3df79d6b38d1f307d2627cd234 100644
--- a/content/common/mac/attributed_string_coder.h
+++ b/content/common/mac/attributed_string_coder.h
@@ -101,7 +101,7 @@ template <>
 struct ParamTraits<mac::AttributedStringCoder::EncodedString> {
   typedef mac::AttributedStringCoder::EncodedString 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);
 };
 
@@ -109,7 +109,7 @@ template <>
 struct ParamTraits<mac::AttributedStringCoder::FontAttribute> {
   typedef mac::AttributedStringCoder::FontAttribute 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);
 };