New CRYPTO_EXPORT macros.

crypto/keychain_mac.h

Index: crypto/keychain_mac.h
diff --git a/crypto/keychain_mac.h b/crypto/keychain_mac.h
index 39ba31c85fb5d4d357adde023f9e2ccf5a08a961..cde96b364f48430ee1036431cb524bd7b54a6fb8 100644
--- a/crypto/keychain_mac.h
+++ b/crypto/keychain_mac.h
@@ -9,6 +9,7 @@
 #include <Security/Security.h>
 
 #include "base/basictypes.h"
+#include "crypto/crypto_export.h"
 
 namespace crypto {
 
@@ -20,7 +21,7 @@ namespace crypto {
 // SecKeychainFoo). The only exception is Free, which should be used for
 // anything returned from this class that would normally be freed with
 // CFRelease (to aid in testing).
-class MacKeychain {
+class CRYPTO_EXPORT MacKeychain {
  public:
   MacKeychain();
   virtual ~MacKeychain();