Move Pickle to base namespace.

net/disk_cache/simple/simple_index.h

Index: net/disk_cache/simple/simple_index.h
diff --git a/net/disk_cache/simple/simple_index.h b/net/disk_cache/simple/simple_index.h
index 099d7fdb80c5ce6869ee2654497572209611b29a..5135c2b3723a2c831bf334e560db65bb383c1992 100644
--- a/net/disk_cache/simple/simple_index.h
+++ b/net/disk_cache/simple/simple_index.h
@@ -28,8 +28,10 @@
 #include "base/android/application_status_listener.h"
 #endif
 
+namespace base {
 class Pickle;
 class PickleIterator;
+}
 
 namespace disk_cache {
 
@@ -49,8 +51,8 @@ class NET_EXPORT_PRIVATE EntryMetadata {
   void SetEntrySize(uint64 entry_size);
 
   // Serialize the data into the provided pickle.
-  void Serialize(Pickle* pickle) const;
-  bool Deserialize(PickleIterator* it);
+  void Serialize(base::Pickle* pickle) const;
+  bool Deserialize(base::PickleIterator* it);
 
   static base::TimeDelta GetLowerEpsilonForTimeComparisons() {
     return base::TimeDelta::FromSeconds(1);