Cleanup: Remove dead code in NewTabUI

chrome/browser/ui/webui/ntp/new_tab_ui.h

Index: chrome/browser/ui/webui/ntp/new_tab_ui.h
diff --git a/chrome/browser/ui/webui/ntp/new_tab_ui.h b/chrome/browser/ui/webui/ntp/new_tab_ui.h
index 1af06edfd724f82bbdbe57d47414d7c70c093528..a35a594cf49d29d8773955da37cccdf1f2dfd17d 100644
--- a/chrome/browser/ui/webui/ntp/new_tab_ui.h
+++ b/chrome/browser/ui/webui/ntp/new_tab_ui.h
@@ -5,9 +5,6 @@
 #ifndef CHROME_BROWSER_UI_WEBUI_NTP_NEW_TAB_UI_H_
 #define CHROME_BROWSER_UI_WEBUI_NTP_NEW_TAB_UI_H_
 
-#include <map>
-#include <string>
-
 #include "base/macros.h"
 #include "base/strings/string16.h"
 #include "components/prefs/pref_change_registrar.h"
@@ -72,20 +69,10 @@ class NewTabUI : public content::WebUIController {
     std::string GetContentSecurityPolicyImgSrc() const override;
     std::string GetContentSecurityPolicyChildSrc() const override;
 
-    // Adds |resource| to the source. |resource_id| is resource id or 0,
-    // which means return empty data set. |mime_type| is mime type of the
-    // resource.
-    void AddResource(const char* resource,
-                     const char* mime_type,
-                     int resource_id);
-
    private:
     // Pointer back to the original profile.
     Profile* profile_;
 
-    // Maps resource files to mime types an resource ids.
-    std::map<std::string, std::pair<std::string, int> > resource_map_;
-
     DISALLOW_COPY_AND_ASSIGN(NewTabHTMLSource);
   };