Make URLDataSource::GetSource() const.

chrome/browser/ui/webui/about_ui.h

 // Copyright (c) 2011 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_ABOUT_UI_H_
 #define CHROME_BROWSER_UI_WEBUI_ABOUT_UI_H_
 
 #include <string>
 
 #include "base/basictypes.h"
 #include "base/compiler_specific.h"
 #include "content/public/browser/url_data_source.h"
 #include "content/public/browser/web_ui_controller.h"
 
 class Profile;
 
 // We expose this class because the OOBE flow may need to explicitly add the
 // chrome://terms source outside of the normal flow.
 class AboutUIHTMLSource : public content::URLDataSource {
  public:
   // Construct a data source for the specified |source_name|.
   AboutUIHTMLSource(const std::string& source_name, Profile* profile);
 
   // 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& path) const OVERRIDE;
   virtual bool ShouldAddContentSecurityPolicy() const OVERRIDE;
   virtual bool ShouldDenyXFrameOptions() const OVERRIDE;
 
   // Send the response data.
   void FinishDataRequest(
@@ skipping 24 matching lines @@
 
 // Helper functions
 void AppendHeader(std::string* output, int refresh,
                   const std::string& unescaped_title);
 void AppendBody(std::string *output);
 void AppendFooter(std::string *output);
 
 }  // namespace about_ui
 
 #endif  // CHROME_BROWSER_UI_WEBUI_ABOUT_UI_H_