Serialize date_created in PasswordStoreX properly

chrome/browser/password_manager/native_backend_kwallet_x.h

Index: chrome/browser/password_manager/native_backend_kwallet_x.h
diff --git a/chrome/browser/password_manager/native_backend_kwallet_x.h b/chrome/browser/password_manager/native_backend_kwallet_x.h
index 2ed7aabce70202a752a58bd8e3a6e6add7c7976e..116cf6faddc27c60e447eea80476a7a3e794a625 100644
--- a/chrome/browser/password_manager/native_backend_kwallet_x.h
+++ b/chrome/browser/password_manager/native_backend_kwallet_x.h
@@ -142,7 +142,7 @@ class NativeBackendKWallet : public PasswordStoreX::NativeBackend {
 
   // In case the fields in the pickle ever change, version them so we can try to
   // read old pickles. (Note: do not eat old pickles past the expiration date.)
-  static const int kPickleVersion = 4;
+  static const int kPickleVersion = 5;
 
   // Generates a profile-specific folder name based on profile_id_.
   std::string GetProfileSpecificFolderName() const;