Don't allow inline install if frame is deleted before user accepts

chrome/browser/extensions/webstore_inline_installer.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_WEBSTORE_INLINE_INSTALLER_H_
 #define CHROME_BROWSER_EXTENSIONS_WEBSTORE_INLINE_INSTALLER_H_
 
 #include <string>
 
 #include "base/memory/ref_counted.h"
@@ skipping 13 matching lines @@
 // post-install UI after successful installation.
 //
 // Clients will be notified of success or failure via the |callback| argument
 // passed into the constructor.
 class WebstoreInlineInstaller : public WebstoreStandaloneInstaller,
                                 public content::WebContentsObserver {
  public:
   typedef WebstoreStandaloneInstaller::Callback Callback;
 
   WebstoreInlineInstaller(content::WebContents* web_contents,
+                          content::RenderFrameHost* host,
                           const std::string& webstore_item_id,
                           const GURL& requestor_url,
                           const Callback& callback);
 
   // Returns true if given |requestor_url| is a verified site according to the
   // given |webstore_data|.
   static bool IsRequestorPermitted(const base::DictionaryValue& webstore_data,
                                    const GURL& requestor_url,
                                    std::string* error);
 
@@ skipping 10 matching lines @@
   content::WebContents* GetWebContents() const override;
   scoped_refptr<ExtensionInstallPrompt::Prompt> CreateInstallPrompt()
       const override;
   bool CheckInlineInstallPermitted(const base::DictionaryValue& webstore_data,
                                    std::string* error) const override;
   bool CheckRequestorPermitted(const base::DictionaryValue& webstore_data,
                                std::string* error) const override;
 
  private:
   // content::WebContentsObserver interface implementation.
+  void FrameDeleted(content::RenderFrameHost* render_frame_host) override;
+  void RenderFrameHostChanged(content::RenderFrameHost* old_host,
+                              content::RenderFrameHost* new_host) override;
   void WebContentsDestroyed() override;
 
   // Checks whether the install is initiated by a page in a verified site
   // (which is at least a domain, but can also have a port or a path).
   static bool IsRequestorURLInVerifiedSite(const GURL& requestor_url,
                                            const std::string& verified_site);
 
+  // This corresponds to the frame that initiated the install request.
+  content::RenderFrameHost* host_;
   GURL requestor_url_;
 
   DISALLOW_IMPLICIT_CONSTRUCTORS(WebstoreInlineInstaller);
 };
 
 }  // namespace extensions
 
 #endif  // CHROME_BROWSER_EXTENSIONS_WEBSTORE_INLINE_INSTALLER_H_