[Search] Tweak the styling for the first-run experience

chrome/browser/search/contextual_search_promo_source_android.cc

 // Copyright 2014 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/search/contextual_search_promo_source_android.h"
 
 #include "base/memory/ref_counted_memory.h"
 #include "base/strings/string_util.h"
 #include "base/strings/stringprintf.h"
 #include "base/values.h"
@@ skipping 73 matching lines @@
   callback.Run(response.get());
 }
 
 void ContextualSearchPromoSourceAndroid::SendHtmlWithStrings(
     const content::URLDataSource::GotDataCallback& callback) {
   base::DictionaryValue strings_data;
   strings_data.SetString(
       "description",
       l10n_util::GetStringUTF16(IDS_CONTEXTUAL_SEARCH_PROMO_DESCRIPTION));
   strings_data.SetString(
+      "heading", l10n_util::GetStringUTF16(IDS_CONTEXTUAL_SEARCH_HEADER));
+  strings_data.SetString(
       "optIn", l10n_util::GetStringUTF16(IDS_CONTEXTUAL_SEARCH_PROMO_OPTIN));
   strings_data.SetString(
       "optOut", l10n_util::GetStringUTF16(IDS_CONTEXTUAL_SEARCH_PROMO_OPTOUT));
   base::StringPiece html(
       ResourceBundle::GetSharedInstance().GetRawDataResource(
          IDR_CONTEXTUAL_SEARCH_PROMO_HTML));
   webui::UseVersion2 version;
   std::string response(webui::GetI18nTemplateHtml(html, &strings_data));
   callback.Run(base::RefCountedString::TakeString(&response));
 }