[Password Generation] Run the form classifier only if AutofillMetadata is enabled

components/password_manager/core/browser/password_manager_driver.h

Index: components/password_manager/core/browser/password_manager_driver.h
diff --git a/components/password_manager/core/browser/password_manager_driver.h b/components/password_manager/core/browser/password_manager_driver.h
index 607d9ce17aad57a9c235c994a54fefd03a9b44e8..be5723c4ec9983ffca1178476713aa5b776bc693 100644
--- a/components/password_manager/core/browser/password_manager_driver.h
+++ b/components/password_manager/core/browser/password_manager_driver.h
@@ -96,6 +96,9 @@ class PasswordManagerDriver
   // chrome://password-manager-internals is available.
   virtual void SendLoggingAvailability() {}
 
+  // Allows the form classifier to find generation fields.
+  virtual void AllowToRunFormClassifier() {}
+
  private:
   DISALLOW_COPY_AND_ASSIGN(PasswordManagerDriver);
 };