Make URLDataSource::GetSource() const.

chrome/browser/ui/webui/ntp/new_tab_ui.cc

 // Copyright (c) 2012 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/ntp/new_tab_ui.h"
 
 #include <set>
 
 #include "apps/app_launcher.h"
 #include "base/i18n/rtl.h"
@@ skipping 291 matching lines @@
   return Profile::FromWebUI(web_ui());
 }
 
 ///////////////////////////////////////////////////////////////////////////////
 // NewTabHTMLSource
 
 NewTabUI::NewTabHTMLSource::NewTabHTMLSource(Profile* profile)
     : profile_(profile) {
 }
 
-std::string NewTabUI::NewTabHTMLSource::GetSource() {
+std::string NewTabUI::NewTabHTMLSource::GetSource() const {
   return chrome::kChromeUINewTabHost;
 }
 
 void NewTabUI::NewTabHTMLSource::StartDataRequest(
     const std::string& path,
     bool is_incognito,
     const content::URLDataSource::GotDataCallback& callback) {
   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
 
   std::map<std::string, std::pair<std::string, int> >::iterator it =
@@ skipping 49 matching lines @@
 void NewTabUI::NewTabHTMLSource::AddResource(const char* resource,
                                              const char* mime_type,
                                              int resource_id) {
   DCHECK(resource);
   DCHECK(mime_type);
   resource_map_[std::string(resource)] =
       std::make_pair(std::string(mime_type), resource_id);
 }
 
 NewTabUI::NewTabHTMLSource::~NewTabHTMLSource() {}