Make URLDataSource::GetSource() const.

chrome/browser/search/local_ntp_source.cc

 // Copyright 2013 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/local_ntp_source.h"
 
 #include "base/logging.h"
 #include "base/memory/ref_counted_memory.h"
 #include "base/string_util.h"
 #include "chrome/common/url_constants.h"
@@ skipping 13 matching lines @@
 const char kCloseBarActiveFilename[] = "images/close_2_active.png";
 
 }  // namespace
 
 LocalNtpSource::LocalNtpSource() {
 }
 
 LocalNtpSource::~LocalNtpSource() {
 }
 
-std::string LocalNtpSource::GetSource() {
+std::string LocalNtpSource::GetSource() const {
   return chrome::kChromeSearchLocalNtpHost;
 }
 
 void LocalNtpSource::StartDataRequest(
     const std::string& path,
     bool is_incognito,
     const content::URLDataSource::GotDataCallback& callback) {
   int identifier = -1;
   if (path == kHtmlFilename) {
     identifier = IDR_LOCAL_NTP_HTML;
@@ skipping 39 matching lines @@
   if (request->url().SchemeIs(chrome::kChromeSearchScheme)) {
     DCHECK(StartsWithASCII(request->url().path(), "/", true));
     std::string filename = request->url().path().substr(1);
     return filename == kHtmlFilename || filename == kJSFilename ||
            filename == kCssFilename || filename == kCloseBarFilename ||
            filename == kCloseBarHoverFilename ||
            filename == kCloseBarActiveFilename;
   }
   return false;
 }