Change the views sign-in dialog to be tab modal.

chrome/browser/ui/views/profiles/signin_view_controller_delegate_views.h

Index: chrome/browser/ui/views/profiles/signin_view_controller_delegate_views.h
diff --git a/chrome/browser/ui/views/profiles/signin_view_controller_delegate_views.h b/chrome/browser/ui/views/profiles/signin_view_controller_delegate_views.h
index 64c9e7533d4663389a33814dfa932d1d3f9ab775..5cb52ce3f03d9d0f87da5e764f7aa3ddd3a4f5e0 100644
--- a/chrome/browser/ui/views/profiles/signin_view_controller_delegate_views.h
+++ b/chrome/browser/ui/views/profiles/signin_view_controller_delegate_views.h
@@ -31,15 +31,6 @@ class WebView;
 class SigninViewControllerDelegateViews : public views::DialogDelegateView,
                                           public SigninViewControllerDelegate {
  public:
-  // Creates and displays a constrained window containing |web_contents|. If
-  // |wait_for_size| is true, the delegate will wait for ResizeNativeView() to
-  // be called by the base class before displaying the constrained window.
-  SigninViewControllerDelegateViews(
-      SigninViewController* signin_view_controller,
-      std::unique_ptr<views::WebView> content_view,
-      Browser* browser,
-      bool wait_for_size);
-
   // 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.
@@ -65,15 +56,27 @@ class SigninViewControllerDelegateViews : public views::DialogDelegateView,
   int GetDialogButtons() const override;
 
  private:
+  friend SigninViewControllerDelegate;
+
+  // Creates and displays a constrained window containing |web_contents|. If
+  // |wait_for_size| is true, the delegate will wait for ResizeNativeView() to
+  // be called by the base class before displaying the constrained window.
+  SigninViewControllerDelegateViews(
+      SigninViewController* signin_view_controller,
+      std::unique_ptr<views::WebView> content_view,
+      Browser* browser,
+      ui::ModalType dialog_modal_type,
+      bool wait_for_size);
+  ~SigninViewControllerDelegateViews() override;
+
   void PerformClose() override;
   void ResizeNativeView(int height) override;
 
   void DisplayModal();
 
-  ~SigninViewControllerDelegateViews() override;
-
   views::WebView* content_view_;
   views::Widget* modal_signin_widget_;  // Not owned.
+  ui::ModalType dialog_modal_type_;
 
   // wait_for_size_ stores whether the dialog should only be shown after its
   // content's size has been laid out and measured so that the constrained