Base: A few more files using BASE_API (for base.dll)

base/pickle.h

Index: base/pickle.h
===================================================================
--- base/pickle.h	(revision 79303)
+++ base/pickle.h	(working copy)
@@ -8,6 +8,7 @@
 
 #include <string>
 
+#include "base/base_api.h"
 #include "base/basictypes.h"
 #include "base/gtest_prod_util.h"
 #include "base/logging.h"
@@ -30,7 +31,7 @@
 // space is controlled by the header_size parameter passed to the Pickle
 // constructor.
 //
-class Pickle {
+class BASE_API Pickle {
  public:
   // Initialize a Pickle object using the default header size.
   Pickle();