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..b339acd4e88fa3c0a57180a069db7287aaa17c5e 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
@@ -43,6 +43,7 @@ class SigninViewControllerDelegateMac : public ConstrainedWindowMacDelegate,
       std::unique_ptr<content::WebContents> web_contents,
       content::WebContents* host_web_contents,
       NSRect frame,
+      DialogModalType dialog_modal_type,
       bool wait_for_size);
 
   void OnConstrainedWindowClosed(ConstrainedWindowMac* window) override;
@@ -74,6 +75,9 @@ class SigninViewControllerDelegateMac : public ConstrainedWindowMacDelegate,
 
   ~SigninViewControllerDelegateMac() override;
 
+  // Called to delete |this|.
+  void DeleteThis();
+
   // The constrained window opened by this delegate to display signin flow
   // content.
   std::unique_ptr<ConstrainedWindowMac> constrained_window_;
@@ -90,6 +94,10 @@ class SigninViewControllerDelegateMac : public ConstrainedWindowMacDelegate,
   // The web contents that the constrained window is displayed off of.
   // Typically, this is going to be the active tab when the window is shown.
   content::WebContents* host_web_contents_;
+
+  // The dialog modal presentation type.
+  DialogModalType dialog_modal_type_;
+
   NSRect window_frame_;
 
   DISALLOW_COPY_AND_ASSIGN(SigninViewControllerDelegateMac);