Implement the new Sync Confirmation dialog on Linux and Windows.

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

Index: chrome/browser/ui/views/frame/browser_view.h
diff --git a/chrome/browser/ui/views/frame/browser_view.h b/chrome/browser/ui/views/frame/browser_view.h
index 13745344028339f939169d9e633fccb183e253fe..fad35bc61dd577ec31fb5faf5c96813feacd10f3 100644
--- a/chrome/browser/ui/views/frame/browser_view.h
+++ b/chrome/browser/ui/views/frame/browser_view.h
@@ -367,6 +367,7 @@ class BrowserView : public BrowserWindow,
       const signin::ManageAccountsParams& manage_accounts_params) override;
   void ShowModalSigninWindow(AvatarBubbleMode mode) override;
   void CloseModalSigninWindow() override;
+  void ShowModalSyncConfirmationWindow() override;
   int GetRenderViewHeightInsetWithDetachedBookmarkBar() override;
   void ExecuteExtensionCommand(const extensions::Extension* extension,
                                const extensions::Command& command) override;