Fix autoupdate_EndToEndTest on veyron_rialto

chrome/browser/chromeos/settings/cros_settings.h

Index: chrome/browser/chromeos/settings/cros_settings.h
diff --git a/chrome/browser/chromeos/settings/cros_settings.h b/chrome/browser/chromeos/settings/cros_settings.h
index adeb416adac238ccea0fa510ce1fb0851b44aeae..09b68078e6c17f5a20eeef4df41218e45005fda2 100644
--- a/chrome/browser/chromeos/settings/cros_settings.h
+++ b/chrome/browser/chromeos/settings/cros_settings.h
@@ -117,6 +117,9 @@ class CrosSettings : public base::NonThreadSafe {
       const std::string& path,
       const base::Closure& callback) WARN_UNUSED_RESULT;
 
+  // Clears all the system setting change callbacks for the specified path.
+  void ClearSettingsObservers(const std::string& path);
+
   // Returns the provider that handles settings with the |path| or prefix.
   CrosSettingsProvider* GetProvider(const std::string& path) const;