Introduce PasswordFormManager::GrabFetcher

components/password_manager/core/browser/password_form_manager.cc

Index: components/password_manager/core/browser/password_form_manager.cc
diff --git a/components/password_manager/core/browser/password_form_manager.cc b/components/password_manager/core/browser/password_form_manager.cc
index c34263fcd92857aa5e7be3e2f8168fa7ee4d1386..07672c44c20d3f55f9c423ba5d99307539eca689 100644
--- a/components/password_manager/core/browser/password_form_manager.cc
+++ b/components/password_manager/core/browser/password_form_manager.cc
@@ -1233,7 +1233,12 @@ void PasswordFormManager::ResetStoredMatches() {
 void PasswordFormManager::GrabFetcher(std::unique_ptr<FormFetcher> fetcher) {
   DCHECK(!owned_form_fetcher_);
   owned_form_fetcher_ = std::move(fetcher);
-  DCHECK_EQ(owned_form_fetcher_.get(), form_fetcher_);
+  if (owned_form_fetcher_.get() == form_fetcher_)
+    return;
+  ResetStoredMatches();
+  form_fetcher_->RemoveConsumer(this);
+  form_fetcher_ = owned_form_fetcher_.get();
+  form_fetcher_->AddConsumer(this);
 }
 
 void PasswordFormManager::SendVotesOnSave() {