Make WebUI webview content script work with incognito.

extensions/browser/declarative_user_script_manager.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_DECLARATIVE_USER_SCRIPT_MANAGER_H_
 #define EXTENSIONS_BROWSER_DECLARATIVE_USER_SCRIPT_MANAGER_H_
 
 #include <map>
 
 #include "base/macros.h"
@@ skipping 14 matching lines @@
  public:
   explicit DeclarativeUserScriptManager(
       content::BrowserContext* browser_context);
   ~DeclarativeUserScriptManager() override;
 
   // Gets the user script master for declarative scripts by the given
   // HostID; if one does not exist, a new object will be created.
   DeclarativeUserScriptMaster* GetDeclarativeUserScriptMasterByID(
       const HostID& host_id);
 
+  DeclarativeUserScriptMaster* GetDeclarativeUserScriptMasterByID(
+      content::BrowserContext* browser_context, const HostID& host_id);
+
  private:
   using UserScriptMasterMap =
       std::map<HostID, linked_ptr<DeclarativeUserScriptMaster>>;
 
   // ExtensionRegistryObserver:
   void OnExtensionUnloaded(content::BrowserContext* browser_context,
                            const Extension* extension,
                            UnloadedExtensionInfo::Reason reason) override;
 
   // Creates a DeclarativeUserScriptMaster object.
   DeclarativeUserScriptMaster* CreateDeclarativeUserScriptMaster(
-      const HostID& host_id);
+      content::BrowserContext* browser_context, const HostID& host_id);
 
   // A map of DeclarativeUserScriptMasters for each host; each master
   // is lazily initialized.
   UserScriptMasterMap declarative_user_script_masters_;
 
   content::BrowserContext* browser_context_;
 
   ScopedObserver<ExtensionRegistry, ExtensionRegistryObserver>
       extension_registry_observer_;
 
   DISALLOW_COPY_AND_ASSIGN(DeclarativeUserScriptManager);
 };
 
 }  // namespace extensions
 
 #endif  // EXTENSIONS_BROWSER_DECLARATIVE_USER_SCRIPT_MANAGER_H_