Disable the autofill password manager when a credential is sent via CM API.

components/password_manager/core/browser/password_manager.cc

Index: components/password_manager/core/browser/password_manager.cc
diff --git a/components/password_manager/core/browser/password_manager.cc b/components/password_manager/core/browser/password_manager.cc
index f734ef0010b49b527f7f87b5d5222a4e5044c519..fcd0c9df57e50477e7f97a852097b5014d4143b4 100644
--- a/components/password_manager/core/browser/password_manager.cc
+++ b/components/password_manager/core/browser/password_manager.cc
@@ -345,6 +345,12 @@ void PasswordManager::UpdateFormManagers() {
   }
 }
 
+void PasswordManager::DropFormManagers() {
+  pending_login_managers_.clear();
+  provisional_save_manager_.reset();
+  all_visible_forms_.clear();
+}
+
 void PasswordManager::RecordFailure(ProvisionalSaveFailure failure,
                                     const GURL& form_origin,
                                     BrowserSavePasswordProgressLogger* logger) {