Make URLDataSource::GetSource() const.

chrome/browser/ui/webui/favicon_source.h

 // 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.
 
 #ifndef CHROME_BROWSER_UI_WEBUI_FAVICON_SOURCE_H_
 #define CHROME_BROWSER_UI_WEBUI_FAVICON_SOURCE_H_
 
 #include <map>
 #include <string>
 
@@ skipping 51 matching lines @@
     FAVICON,
     // Any available icon in the priority of TOUCH_ICON_PRECOMPOSED, TOUCH_ICON,
     // FAVICON, and default favicon.
     ANY
   };
 
   // |type| is the type of icon this FaviconSource will provide.
   FaviconSource(Profile* profile, IconType type);
 
   // content::URLDataSource implementation.
-  virtual std::string GetSource() OVERRIDE;
+  virtual std::string GetSource() const OVERRIDE;
   virtual void StartDataRequest(
       const std::string& path,
       bool is_incognito,
       const content::URLDataSource::GotDataCallback& callback) OVERRIDE;
   virtual std::string GetMimeType(const std::string&) const OVERRIDE;
   virtual bool ShouldReplaceExistingSource() const OVERRIDE;
   virtual bool ShouldServiceRequest(
       const net::URLRequest* request) const OVERRIDE;
 
  protected:
@@ skipping 48 matching lines @@
   // database doesn't have a favicon for a webpage. Indexed by IconSize values.
   scoped_refptr<base::RefCountedMemory> default_favicons_[NUM_SIZES];
 
   // The history::IconTypes of icon that this FaviconSource handles.
   int icon_types_;
 
   DISALLOW_COPY_AND_ASSIGN(FaviconSource);
 };
 
 #endif  // CHROME_BROWSER_UI_WEBUI_FAVICON_SOURCE_H_