Refactoring: de-couple Extensions from "script injection System" [render side]:3

extensions/renderer/web_ui_injection_host.h

+// Copyright 2015 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_RENDERER_WEBUI_INJECTION_HOST_H_
+#define EXTENSIONS_RENDERER_WEBUI_INJECTION_HOST_H_
+
+#include "extensions/renderer/injection_host.h"
+
+class WebUIInjectionHost : public InjectionHost {
+ public:
+  WebUIInjectionHost(const HostID& host_id);
+  ~WebUIInjectionHost() override;
+
+ private:
+  // InjectionHost:
+  std::string GetContentSecurityPolicy() const override;
+  const GURL& url() const override;
+  const std::string& name() const override;
+  extensions::PermissionsData::AccessType CanExecuteOnFrame(
+      const GURL& document_url,
+      const GURL& top_frame_url,
+      int tab_id,
+      bool is_declarative) const override;
+  bool ShouldNotifyBrowserOfInjection() const override;
+
+ private:
+  GURL url_;
+
+  DISALLOW_COPY_AND_ASSIGN(WebUIInjectionHost);
+};
+
+#endif  // EXTENSIONS_RENDERER_WEBUI_INJECTION_HOST_H_