Replacing DCHECK with return.

With CL https://chromium-review.googlesource.com/c/chromium/src/+/1530980
NewPasswordFormManager::PasswordNoLongerGenerated might be called when
NewPasswordFormManager is not in generating state.

Bug: 886583, 866444

Change-Id: If69df52c77c10d195fad8b992462595942d45c11
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1561125Reviewed-by: Maxim Kolosovskiy <kolos@chromium.org>
Commit-Queue: Vadym Doroshenko <dvadym@chromium.org>
Cr-Commit-Position: refs/heads/master@{#649857}

components/password_manager/core/browser/new_password_form_manager.cc

@@ -421,7 +421,9 @@ void NewPasswordFormManager::PresaveGeneratedPassword(
 }
 
 void NewPasswordFormManager::PasswordNoLongerGenerated() {
-  DCHECK(HasGeneratedPassword());
+  if (!HasGeneratedPassword())
+    return;
+
   form_saver_->RemovePresavedPassword();
   generated_password_.clear();
   votes_uploader_.set_has_generated_password(false);