Implement the new Sync Confirmation dialog on Linux and Windows.

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

Index: chrome/browser/ui/views/profiles/signin_view_controller.h
diff --git a/chrome/browser/ui/views/profiles/signin_view_controller.h b/chrome/browser/ui/views/profiles/signin_view_controller.h
index 668be1489e9e2141e059bb48dbfbc618742a1d76..bffd3be692687aff81c7e26d3ba0b5a31a8dd6ca 100644
--- a/chrome/browser/ui/views/profiles/signin_view_controller.h
+++ b/chrome/browser/ui/views/profiles/signin_view_controller.h
@@ -37,6 +37,8 @@ class SigninViewController {
       profiles::BubbleViewMode mode,
       Profile* profile);
 
+  static views::WebView* CreateSyncConfirmationWebView(Profile* profile);
+
   // Shows the signin flow as a tab modal dialog attached to |browser|'s active
   // web contents.
   void ShowModalSignin(profiles::BubbleViewMode mode, Browser* browser);
@@ -45,6 +47,8 @@ class SigninViewController {
   // SigninViewController, if one exists. Does nothing otherwise.
   void CloseModalSignin();
 
+  void ShowModalSyncConfirmationDialog(Browser* browser);
+
   // Notifies this object that it's |modal_signin_delegate_| member has become
   // invalid.
   void ResetModalSigninDelegate();