Update WebstoreInstaller to be ref counted.

chrome/browser/extensions/webstore_installer.h

 // Copyright (c) 2011 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_WEBSTORE_INSTALLER_H_
 #define CHROME_BROWSER_EXTENSIONS_WEBSTORE_INSTALLER_H_
 #pragma once
 
 #include <string>
 #include <vector>
 
 #include "base/compiler_specific.h"
+#include "base/memory/ref_counted.h"
 #include "content/public/browser/notification_observer.h"
 #include "content/public/browser/notification_registrar.h"
+#include "googleurl/src/gurl.h"
 
-class GURL;
+class NavigationController;
 class Profile;
 
 // Downloads and installs extensions from the web store.
-class WebstoreInstaller : public content::NotificationObserver {
+class WebstoreInstaller : public content::NotificationObserver,
+                          public base::RefCounted<WebstoreInstaller> {
  public:
   enum Flag {
     FLAG_NONE = 0,
 
     // Inline installs trigger slightly different behavior (install source
     // is different, download referrers are the item's page in the gallery).
     FLAG_INLINE_INSTALL = 1 << 0
   };
 
   class Delegate {
    public:
     virtual void OnExtensionInstallSuccess(const std::string& id) = 0;
     virtual void OnExtensionInstallFailure(const std::string& id,
                                            const std::string& error) = 0;
   };
 
-  explicit WebstoreInstaller(Profile* profile);
+
+  // Creates a WebstoreInstaller for downloading and installing the extension
+  // with the given |id| from the Chrome Web Store. If |delegate| is not NULL,
+  // it will be notified when the install succeeds or fails. The installer will
+  // use the specified |controller| to download the extension. Only one
+  // WebstoreInstaller can use a specific controller at any given time.
+  // Note: the delegate should stay alive until being called back.
+  WebstoreInstaller(Profile* profile,
+                    Delegate* delegate,
+                    NavigationController* controller,
+                    const std::string& id,
+                    int flags);
   virtual ~WebstoreInstaller();
 
-  // Download and install the extension with the given |id| from the Chrome
-  // Web Store. If |delegate| is not NULL, it will be notified when the
-  // install succeeds or fails.
-  // Note: the delegate should stay alive until being called back.
-  void InstallExtension(const std::string& id, Delegate* delegate, int flags);
+  // Starts downloading and installing the extension.
+  void Start();
 
   // content::NotificationObserver
   virtual void Observe(int type,
                        const content::NotificationSource& source,
                        const content::NotificationDetails& details) OVERRIDE;
 
  private:
-  struct PendingInstall;
-
-  // Removes the PendingIntall data for the given extension, returning true and
-  // setting |install| if there is such data.
-  bool ClearPendingInstall(const std::string& id, PendingInstall* install);
-
-  // Creates the PendingInstall for the specified extension.
-  const PendingInstall& CreatePendingInstall(
-      const std::string& id, GURL install_url, Delegate* delegate);
-
-  // Gets the extension id for the given gallery install |url|.
-  std::string GetPendingInstallId(const GURL& url);
-
   // Reports an install |error| to the delegate for the given extension if this
   // managed its installation. This also removes the associated PendingInstall.
-  void ReportFailure(const std::string& id, const std::string& error);
+  void ReportFailure(const std::string& error);
 
   // Reports a successful install to the delegate for the given extension if
   // this managed its installation. This also removes the associated
   // PendingInstall.
-  void ReportSuccess(const std::string& id);
+  void ReportSuccess();
 
   content::NotificationRegistrar registrar_;
   Profile* profile_;
-  std::vector<PendingInstall> pending_installs_;
+  Delegate* delegate_;
+  NavigationController* controller_;
+  std::string id_;
+  int flags_;
+  GURL download_url_;
 };
 
 #endif  // CHROME_BROWSER_EXTENSIONS_WEBSTORE_INSTALLER_H_