PasswordStore: Clean up expectations about rewriting vectors of forms

chrome/browser/password_manager/native_backend_gnome_x.h

Index: chrome/browser/password_manager/native_backend_gnome_x.h
diff --git a/chrome/browser/password_manager/native_backend_gnome_x.h b/chrome/browser/password_manager/native_backend_gnome_x.h
index 438917a5e009e69a0d92fc5802e092d0db41d404..6108771b9b1521be87405ddbed57da16ee724f9f 100644
--- a/chrome/browser/password_manager/native_backend_gnome_x.h
+++ b/chrome/browser/password_manager/native_backend_gnome_x.h
@@ -120,7 +120,9 @@ class NativeBackendGnome : public PasswordStoreX::NativeBackend,
   // Adds a login form without checking for one to replace first.
   bool RawAddLogin(const autofill::PasswordForm& form);
 
-  // Reads PasswordForms from the keyring with the given autofillability state.
+  // Overwrites |forms| with blacklisted or autofillable, depending on
+  // |autofillable| being false or true, credentials from the keyring. In case
+  // of failures returns false and erases |forms|, otherwise returns true.
   bool GetLoginsList(bool autofillable,
                      ScopedVector<autofill::PasswordForm>* forms);