Make ChromePasswordManagerClient::BindCredentialManager handle missing client gracefully

chrome/browser/password_manager/chrome_password_manager_client_unittest.cc

Index: chrome/browser/password_manager/chrome_password_manager_client_unittest.cc
diff --git a/chrome/browser/password_manager/chrome_password_manager_client_unittest.cc b/chrome/browser/password_manager/chrome_password_manager_client_unittest.cc
index 82edfffa98a167ce0d119560cfe8d464c7265ace..b47c5760b9b8b55c318669e8ba7bb5638bf8b38c 100644
--- a/chrome/browser/password_manager/chrome_password_manager_client_unittest.cc
+++ b/chrome/browser/password_manager/chrome_password_manager_client_unittest.cc
@@ -549,3 +549,21 @@ TEST_F(ChromePasswordManagerClientTest, AnnotateNavigationEntryTrueToFalse) {
       SerializedNavigationEntry::HAS_PASSWORD_FIELD,
       GetPasswordStateFromNavigation(*controller().GetLastCommittedEntry()));
 }
+
+// Handle missing ChromePasswordManagerClient instance in BindCredentialManager
+// gracefully.
+TEST_F(ChromePasswordManagerClientTest, BindCredentialManager_MissingInstance) {
+  // Create a WebContent without tab helpers.
+  std::unique_ptr<content::WebContents> web_contents(
+      content::WebContents::Create(
+          content::WebContents::CreateParams(profile())));
+  // In particular, this WebContent should not have the
+  // ChromePasswordManagerClient.
+  ASSERT_FALSE(
+      ChromePasswordManagerClient::FromWebContents(web_contents.get()));
+
+  // This call should not crash.
+  ChromePasswordManagerClient::BindCredentialManager(
+      web_contents->GetMainFrame(),
+      password_manager::mojom::CredentialManagerRequest());
+}