md-settings: add reset request origin to reset feedback proto.

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

 // Copyright 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 <stddef.h>
 
 #include "base/macros.h"
 #include "base/values.h"
 #include "chrome/browser/google/google_brand.h"
 #include "chrome/browser/profile_resetter/profile_resetter.h"
@@ skipping 74 matching lines @@
   TestingProfile profile_;
   content::TestWebUI web_ui_;
   std::unique_ptr<TestingResetSettingsHandler> handler_;
 };
 
 TEST_F(ResetSettingsHandlerTest, HandleResetProfileSettings) {
   base::ListValue list;
   std::string expected_callback_id("dummyCallbackId");
   list.AppendString(expected_callback_id);
   list.AppendBoolean(false);
+  list.AppendString("");
   handler()->HandleResetProfileSettings(&list);
   // Check that the delegate ProfileResetter was called.
   EXPECT_EQ(1u, handler()->resets());
   // Check that Javascript side is notified after resetting is done.
   EXPECT_EQ("cr.webUIResponse",
             web_ui()->call_data()[0]->function_name());
   std::string callback_id;
   EXPECT_TRUE(web_ui()->call_data()[0]->arg1()->GetAsString(&callback_id));
   EXPECT_EQ(expected_callback_id, callback_id);
 }
 
 }  // namespace