Update behavior of one-click infobar to remove modal dialog, add "undo".

chrome/browser/ui/cocoa/browser_window_cocoa.h

Index: chrome/browser/ui/cocoa/browser_window_cocoa.h
diff --git a/chrome/browser/ui/cocoa/browser_window_cocoa.h b/chrome/browser/ui/cocoa/browser_window_cocoa.h
index e47b7ebd31a3af37f7e611aa383a0f48291b4968..f3498a71d1bec61ccd69369b0222c70607dce5c4 100644
--- a/chrome/browser/ui/cocoa/browser_window_cocoa.h
+++ b/chrome/browser/ui/cocoa/browser_window_cocoa.h
@@ -95,8 +95,7 @@ class BrowserWindowCocoa : public BrowserWindow,
   virtual void ShowChromeToMobileBubble() OVERRIDE;
 #if defined(ENABLE_ONE_CLICK_SIGNIN)
   virtual void ShowOneClickSigninBubble(
-      const base::Closure& learn_more_callback,
-      const base::Closure& advanced_callback) OVERRIDE;
+      const base::Callback<void(bool)>& start_sync_callback) OVERRIDE;
 #endif
   virtual bool IsDownloadShelfVisible() const OVERRIDE;
   virtual DownloadShelf* GetDownloadShelf() OVERRIDE;