[Mac] CREDENTIAL: Fix chooser dialog after r380352

chrome/browser/ui/cocoa/passwords/password_prompt_view_bridge.mm

Index: chrome/browser/ui/cocoa/passwords/password_prompt_view_bridge.mm
diff --git a/chrome/browser/ui/cocoa/passwords/password_prompt_view_bridge.mm b/chrome/browser/ui/cocoa/passwords/password_prompt_view_bridge.mm
index ff55e44ec33430e82d37ac512d2a1634ca268485..be9929d6ed6a8e4068b05bb45470b5bce9415351 100644
--- a/chrome/browser/ui/cocoa/passwords/password_prompt_view_bridge.mm
+++ b/chrome/browser/ui/cocoa/passwords/password_prompt_view_bridge.mm
@@ -69,8 +69,8 @@ void PasswordPromptViewBridge::ShowWindow() {
   [window setContentView:[view_controller_ view]];
   base::scoped_nsobject<CustomConstrainedWindowSheet> sheet(
       [[CustomConstrainedWindowSheet alloc] initWithCustomWindow:window]);
-  constrained_window_.reset(
-      new ConstrainedWindowMac(this, web_contents_, sheet));
+  constrained_window_ =
+      CreateAndShowWebModalDialogMac(this, web_contents_, sheet);
 }
 
 AccountChooserPrompt* CreateAccountChooserPromptView(