Make URLDataSource::GetSource() const.

chrome/browser/printing/cloud_print/cloud_print_setup_source.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/printing/cloud_print/cloud_print_setup_source.h"
 
 #include "base/memory/ref_counted_memory.h"
 #include "base/message_loop.h"
 #include "base/utf_string_conversions.h"
 #include "base/values.h"
@@ skipping 25 matching lines @@
                const std::string& key,
                int resource_id) {
   dictionary->SetString(key, l10n_util::GetStringUTF16(resource_id));
 }
 
 }  // namespace
 
 CloudPrintSetupSource::CloudPrintSetupSource() {
 }
 
-std::string CloudPrintSetupSource::GetSource() {
+std::string CloudPrintSetupSource::GetSource() const {
   return chrome::kChromeUICloudPrintSetupHost;
 }
 
 void CloudPrintSetupSource::StartDataRequest(
     const std::string& path_raw,
     bool is_incognito,
     const content::URLDataSource::GotDataCallback& callback) {
   const char kCloudPrintSetupPath[] = "cloudprintsetup";
   const char kCloudPrintGaiaLoginPath[] = "gaialogin";
   const char kCloudPrintSetupFlowPath[] = "setupflow";
@@ skipping 81 matching lines @@
   return false;
 }
 
 std::string CloudPrintSetupSource::GetLocalizedUrl(
     const std::string& url) const {
   GURL original_url(url);
   DCHECK(original_url.is_valid());
   GURL localized_url = google_util::AppendGoogleLocaleParam(original_url);
   return localized_url.spec();
 }