Make WebUI webview content script work with incognito.

extensions/browser/user_script_loader.h

 // Copyright 2014 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 EXTENSIONS_BROWSER_USER_SCRIPT_LOADER_H_
 #define EXTENSIONS_BROWSER_USER_SCRIPT_LOADER_H_
 
 #include <map>
 #include <set>
 
@@ skipping 44 matching lines @@
 
   // Add |scripts| to the set of scripts managed by this loader.
   void AddScripts(const std::set<UserScript>& scripts);
 
   // Add |scripts| to the set of scripts managed by this loader.
   // The fetch of the content of the script starts URL request
   // to the associated render specified by
   // |render_process_id, render_view_id|.
   virtual void AddScripts(const std::set<UserScript>& scripts,
                           int render_process_id,
-                          int render_view_id);
+                          int render_view_id,
+                          bool is_incognito);
 
   // Remove |scripts| from the set of scripts managed by this loader.
   void RemoveScripts(const std::set<UserScript>& scripts);
 
   // Clears the set of scripts managed by this loader.
   void ClearScripts();
 
   // Initiates procedure to start loading scripts on the file thread.
   void StartLoad();
 
@@ skipping 87 matching lines @@
   // ID of the host that owns these scripts, if any. This is only set to a
   // non-empty value for declarative user script shared memory regions.
   HostID host_id_;
 
   DISALLOW_COPY_AND_ASSIGN(UserScriptLoader);
 };
 
 }  // namespace extensions
 
 #endif  // EXTENSIONS_BROWSER_USER_SCRIPT_LOADER_H_