Implement the new Sync Confirmation dialog on Linux and Windows.

chrome/browser/ui/views/frame/browser_view.cc

Index: chrome/browser/ui/views/frame/browser_view.cc
diff --git a/chrome/browser/ui/views/frame/browser_view.cc b/chrome/browser/ui/views/frame/browser_view.cc
index 08d9722429b99133460ec0864c87c0a2a0d22770..4e12a78a1d40ee49cc171eacf732f9fa7cbd3256 100644
--- a/chrome/browser/ui/views/frame/browser_view.cc
+++ b/chrome/browser/ui/views/frame/browser_view.cc
@@ -2562,7 +2562,6 @@ void BrowserView::ShowAvatarBubbleFromAvatarButton(
   profiles::TutorialMode tutorial_mode;
   profiles::BubbleViewModeFromAvatarBubbleMode(mode, &bubble_view_mode,
                                                &tutorial_mode);
-
   if (SigninViewController::ShouldShowModalSigninForMode(bubble_view_mode)) {
     ShowModalSigninWindow(mode);
   } else {
@@ -2577,6 +2576,10 @@ void BrowserView::ShowAvatarBubbleFromAvatarButton(
 #endif
 }
 
+void BrowserView::CloseModalSigninWindow() {
+  signin_view_controller_.CloseModalSignin();
+}
+
 void BrowserView::ShowModalSigninWindow(AvatarBubbleMode mode) {
   profiles::BubbleViewMode bubble_view_mode;
   profiles::TutorialMode tutorial_mode;
@@ -2585,8 +2588,8 @@ void BrowserView::ShowModalSigninWindow(AvatarBubbleMode mode) {
   signin_view_controller_.ShowModalSignin(bubble_view_mode, browser());
 }
 
-void BrowserView::CloseModalSigninWindow() {
-  signin_view_controller_.CloseModalSignin();
+void BrowserView::ShowModalSyncConfirmationWindow() {
+  signin_view_controller_.ShowModalSyncConfirmationDialog(browser());
 }
 
 int BrowserView::GetRenderViewHeightInsetWithDetachedBookmarkBar() {