MD Settings: Add helper method for responding to cr.sendWithPromise.

chrome/browser/ui/webui/settings/appearance_handler.cc

 // Copyright (c) 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "chrome/browser/ui/webui/settings/appearance_handler.h"
 
 #include "base/bind.h"
 #include "base/logging.h"
 #include "base/values.h"
 #include "chrome/browser/chrome_notification_types.h"
@@ skipping 53 matching lines @@
   bool is_system_theme = false;
 
   // TODO(jhawkins): Handle native/system theme button.
 
   bool is_classic_theme = !is_system_theme &&
                           theme_service->UsingDefaultTheme();
   return base::FundamentalValue(!is_classic_theme);
 }
 
 void AppearanceHandler::GetResetThemeEnabled(const base::ListValue* args) {
-  CHECK_EQ(2U, args->GetSize());
-
-  std::string callbackFn;
-  CHECK(args->GetString(0, &callbackFn));
+  CHECK_EQ(1U, args->GetSize());
   const base::Value* callbackId;

[Dan Beam, 2016/01/27 00:23:57]

callback_id

[dpapad, 2016/01/27 00:45:23]

Done.

-  CHECK(args->Get(1, &callbackId));
+  CHECK(args->Get(0, &callbackId));
 
   base::FundamentalValue enabled(QueryResetThemeEnabledState());
-  web_ui()->CallJavascriptFunction(callbackFn, *callbackId, enabled);
+  CallJavascriptCallback(web_ui(), *callbackId, enabled);
 }
 
 }  // namespace settings