net: Add NET_API to net/base

net/base/address_list.h

Index: net/base/address_list.h
===================================================================
--- net/base/address_list.h	(revision 85332)
+++ net/base/address_list.h	(working copy)
@@ -9,6 +9,7 @@
 #include <string>
 
 #include "base/memory/ref_counted.h"
+#include "net/base/net_api.h"
 #include "net/base/net_util.h"
 
 // TODO(eroman): Fix the declaration + definition ordering to match style guide.
@@ -19,7 +20,7 @@
 
 // An AddressList object contains a linked list of addrinfo structures.  This
 // class is designed to be copied around by value.
-class AddressList {
+class NET_API AddressList {
  public:
   // Constructs an invalid address list. Should not call any methods on this
   // other than assignment.