Using native sheet to display modal dialogs for sign in

chrome/browser/ui/cocoa/profiles/signin_view_controller_delegate_mac.h

Index: chrome/browser/ui/cocoa/profiles/signin_view_controller_delegate_mac.h
diff --git a/chrome/browser/ui/cocoa/profiles/signin_view_controller_delegate_mac.h b/chrome/browser/ui/cocoa/profiles/signin_view_controller_delegate_mac.h
index d0dd30235fdf77c5ba21c658a55db62ed7cfa83f..0bd808d79b7c0ab05474bb4c898262f167d89419 100644
--- a/chrome/browser/ui/cocoa/profiles/signin_view_controller_delegate_mac.h
+++ b/chrome/browser/ui/cocoa/profiles/signin_view_controller_delegate_mac.h
@@ -9,12 +9,10 @@
 
 #include "base/mac/scoped_nsobject.h"
 #include "base/macros.h"
-#include "chrome/browser/ui/cocoa/constrained_window/constrained_window_mac.h"
 #include "chrome/browser/ui/profile_chooser_constants.h"
 #include "chrome/browser/ui/signin_view_controller_delegate.h"
 
 @class ConstrainedWindowCustomWindow;
-class ConstrainedWindowMac;
 class Profile;
 
 namespace content {
@@ -30,8 +28,7 @@ enum class AccessPoint;
 // managing the Signin and Sync Confirmation tab-modal dialogs.
 // Instances of this class delete themselves when the window they manage is
 // closed (in the OnConstrainedWindowClosed callback).
-class SigninViewControllerDelegateMac : public ConstrainedWindowMacDelegate,
-                                        public SigninViewControllerDelegate {
+class SigninViewControllerDelegateMac : public SigninViewControllerDelegate {
  public:
   // Creates and displays a constrained window off of |host_web_contents|,
   // containing |web_contents|. If |wait_for_size| is true, the delegate will
@@ -45,8 +42,6 @@ class SigninViewControllerDelegateMac : public ConstrainedWindowMacDelegate,
       NSRect frame,
       bool wait_for_size);
 
-  void OnConstrainedWindowClosed(ConstrainedWindowMac* window) override;
-
   // Creates the web view that contains the signin flow in |mode| using
   // |profile| as the web content's profile, then sets |delegate| as the created
   // web content's delegate.
@@ -74,10 +69,6 @@ class SigninViewControllerDelegateMac : public ConstrainedWindowMacDelegate,
 
   ~SigninViewControllerDelegateMac() override;
 
-  // The constrained window opened by this delegate to display signin flow
-  // content.
-  std::unique_ptr<ConstrainedWindowMac> constrained_window_;
-
   // The web contents displayed in the constrained window.
   std::unique_ptr<content::WebContents> web_contents_;
   base::scoped_nsobject<ConstrainedWindowCustomWindow> window_;