Add ref count to service workers for extension API.

chrome/browser/extensions/api/tabs/tabs_api.h

 // Copyright (c) 2012 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_EXTENSIONS_API_TABS_TABS_API_H_
 #define CHROME_BROWSER_EXTENSIONS_API_TABS_TABS_API_H_
 
 #include <string>
 #include <vector>
 
@@ skipping 136 matching lines @@
  protected:
   ~TabsUpdateFunction() override {}
   virtual bool UpdateURL(const std::string& url,
                          int tab_id,
                          bool* is_async);
   virtual void PopulateResult();
 
   content::WebContents* web_contents_;
 
  private:
+  void AfterFakeAsyncDelay();
   bool RunAsync() override;
   void OnExecuteCodeFinished(const std::string& error,
                              const GURL& on_url,
                              const base::ListValue& script_result);
 
   DECLARE_EXTENSION_FUNCTION("tabs.update", TABS_UPDATE)
 };
 class TabsMoveFunction : public ChromeSyncExtensionFunction {
   ~TabsMoveFunction() override {}
   bool RunSync() override;
@@ skipping 151 matching lines @@
   ~TabsGetZoomSettingsFunction() override {}
 
   bool RunAsync() override;
 
   DECLARE_EXTENSION_FUNCTION("tabs.getZoomSettings", TABS_GETZOOMSETTINGS)
 };
 
 }  // namespace extensions
 
 #endif  // CHROME_BROWSER_EXTENSIONS_API_TABS_TABS_API_H_