Introduce PasswordFormManager::ResetStoredMatches

components/password_manager/core/browser/password_form_manager.h

Index: components/password_manager/core/browser/password_form_manager.h
diff --git a/components/password_manager/core/browser/password_form_manager.h b/components/password_manager/core/browser/password_form_manager.h
index fa0257629d4a0411791a19be3a2de1b3d4f7bb70..47429bd652610226b9cd6e39df5f41691cfa4aac 100644
--- a/components/password_manager/core/browser/password_form_manager.h
+++ b/components/password_manager/core/browser/password_form_manager.h
@@ -242,6 +242,11 @@ class PasswordFormManager : public FormFetcher::Consumer {
 
   FormSaver* form_saver() { return form_saver_.get(); }
 
+  // Clears references to matches derived from the associated FormFetcher data.
+  // After calling this, the PasswordFormManager holds no references to objects
+  // owned by the associated FormFetcher.
+  void ResetStoredMatches();
+
  protected:
   // FormFetcher::Consumer:
   void ProcessMatches(