MHTMLGenerationManager handles the death of a render process.

content/browser/download/mhtml_generation_manager.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 CONTENT_BROWSER_DOWNLOAD_MHTML_GENERATION_MANAGER_H_
 #define CONTENT_BROWSER_DOWNLOAD_MHTML_GENERATION_MANAGER_H_
 
 #include <map>
 
 #include "base/memory/singleton.h"
 #include "base/platform_file.h"
 #include "base/process/process.h"
+#include "content/public/browser/notification_observer.h"
+#include "content/public/browser/notification_registrar.h"
 #include "ipc/ipc_platform_file.h"
 
 namespace base {
 class FilePath;
 }
 
 namespace content {
 class WebContents;
 
-class MHTMLGenerationManager {
+class MHTMLGenerationManager : public NotificationObserver {
  public:
   static MHTMLGenerationManager* GetInstance();
 
   typedef base::Callback<void(const base::FilePath& /* path to the MHTML file */,
       int64 /* size of the file */)> GenerateMHTMLCallback;
 
   // Instructs the render view to generate a MHTML representation of the current
   // page for |web_contents|.
   void GenerateMHTML(WebContents* web_contents,
                      const base::FilePath& file,
                      const GenerateMHTMLCallback& callback);
 
   // Notification from the renderer that the MHTML generation finished.
   // |mhtml_data_size| contains the size in bytes of the generated MHTML data,
   // or -1 in case of failure.
   void MHTMLGenerated(int job_id, int64 mhtml_data_size);
 
+  // Implementation of NotificationObserver.

[Jay Civelli, 2013/08/01 17:57:00]

Nit: could be moved to the private section.

[qsr, 2013/08/02 14:22:24]

Done.

+  virtual void Observe(int type,
+                       const NotificationSource& source,
+                       const NotificationDetails& details) OVERRIDE;
+
  private:
   friend struct DefaultSingletonTraits<MHTMLGenerationManager>;
 
   struct Job{
     Job();
     ~Job();
 
     base::FilePath file_path;
 
     // The handles to file the MHTML is saved to, for the browser and renderer
@@ skipping 28 matching lines @@
   // Called on the file thread to close the file the MHTML was saved to.
   void CloseFile(base::PlatformFile file);
 
   // Called on the UI thread when a job has been processed (successfully or
   // not).  Closes the file and removes the job from the job map.
   // |mhtml_data_size| is -1 if the MHTML generation failed.
   void JobFinished(int job_id, int64 mhtml_data_size);
 
   typedef std::map<int, Job> IDToJobMap;
   IDToJobMap id_to_job_;
+  NotificationRegistrar registrar_;
 
   DISALLOW_COPY_AND_ASSIGN(MHTMLGenerationManager);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_DOWNLOAD_MHTML_GENERATION_MANAGER_H_