Make URLDataSource::GetSource() const.

chrome/browser/ui/webui/favicon_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/ui/webui/favicon_source.h"
 
 #include "base/bind.h"
 #include "base/bind_helpers.h"
 #include "base/strings/string_number_conversions.h"
 #include "chrome/browser/favicon/favicon_service_factory.h"
@@ skipping 58 matching lines @@
 FaviconSource::FaviconSource(Profile* profile, IconType type)
     : profile_(profile->GetOriginalProfile()),
       icon_types_(type == FAVICON ? history::FAVICON :
           history::TOUCH_PRECOMPOSED_ICON | history::TOUCH_ICON |
           history::FAVICON) {
 }
 
 FaviconSource::~FaviconSource() {
 }
 
-std::string FaviconSource::GetSource() {
+std::string FaviconSource::GetSource() const {
   return icon_types_ == history::FAVICON ?
       chrome::kChromeUIFaviconHost : chrome::kChromeUITouchIconHost;
 }
 
 void FaviconSource::StartDataRequest(
     const std::string& raw_path,
     bool is_incognito,
     const content::URLDataSource::GotDataCallback& callback) {
   FaviconService* favicon_service =
       FaviconServiceFactory::GetForProfile(profile_, Profile::EXPLICIT_ACCESS);
@@ skipping 188 matching lines @@
 
   if (!default_favicon) {
     ui::ScaleFactor scale_factor = icon_request.scale_factor;
     default_favicon = ResourceBundle::GetSharedInstance()
         .LoadDataResourceBytesForScale(resource_id, scale_factor);
     default_favicons_[favicon_index] = default_favicon;
   }
 
   icon_request.callback.Run(default_favicon);
 }