Move Pickle to base namespace.

content/common/media/media_param_traits.h

Index: content/common/media/media_param_traits.h
diff --git a/content/common/media/media_param_traits.h b/content/common/media/media_param_traits.h
index 94e2cd0970a8aa7c737af069b7288fceedd730c0..64bc15c8f5e3301a2bb33c21ee9c5e5f07628240 100644
--- a/content/common/media/media_param_traits.h
+++ b/content/common/media/media_param_traits.h
@@ -20,7 +20,7 @@ template <>
 struct CONTENT_EXPORT ParamTraits<media::AudioParameters> {
   typedef media::AudioParameters 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);
 };
 
@@ -28,7 +28,7 @@ template <>
 struct CONTENT_EXPORT ParamTraits<media::VideoCaptureFormat> {
   typedef media::VideoCaptureFormat 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);
 };