Mojo C++ bindings: Remove more use_new_wrapper_types=false.

components/contextual_search/browser/contextual_search_js_api_service_impl.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 "components/contextual_search/browser/contextual_search_js_api_service_impl.h"
 
 #include <utility>
 
 #include "components/contextual_search/browser/contextual_search_js_api_handler.h"
 #include "mojo/public/cpp/bindings/strong_binding.h"
 
 namespace contextual_search {
 
 ContextualSearchJsApiServiceImpl::ContextualSearchJsApiServiceImpl(
     ContextualSearchJsApiHandler* contextual_search_js_api_handler)
     : contextual_search_js_api_handler_(contextual_search_js_api_handler) {}
 
 ContextualSearchJsApiServiceImpl::~ContextualSearchJsApiServiceImpl() {}
 
 void ContextualSearchJsApiServiceImpl::HandleSetCaption(
-    const mojo::String& caption,
+    const std::string& caption,
     bool does_answer) {
   contextual_search_js_api_handler_->SetCaption(caption, does_answer);
 }
 
 // static
 void CreateContextualSearchJsApiService(
     ContextualSearchJsApiHandler* contextual_search_js_api_handler,
     mojo::InterfaceRequest<mojom::ContextualSearchJsApiService> request) {
   mojo::MakeStrongBinding(base::MakeUnique<ContextualSearchJsApiServiceImpl>(
                               contextual_search_js_api_handler),
                           std::move(request));
 }
 
 }  // namespace contextual_search