Revert "Refactor CrashDump*Manager to use a shared CrashDumpObserver singleton."

components/crash/content/browser/crash_dump_observer_android.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 COMPONENTS_CRASH_CONTENT_BROWSER_CRASH_DUMP_OBSERVER_ANDROID_H_
-#define COMPONENTS_CRASH_CONTENT_BROWSER_CRASH_DUMP_OBSERVER_ANDROID_H_
-
-#include <list>
-#include <memory>
-
-#include "base/android/application_status_listener.h"
-#include "base/memory/singleton.h"
-#include "base/process/kill.h"
-#include "base/process/process.h"
-#include "content/public/browser/browser_child_process_observer.h"
-#include "content/public/browser/file_descriptor_info.h"
-#include "content/public/browser/notification_observer.h"
-#include "content/public/browser/notification_registrar.h"
-#include "content/public/common/process_type.h"
-
-namespace breakpad {
-
-// This class centralises the observation of child processes for the
-// purpose of reacting to child process crashes.
-class CrashDumpObserver : public content::BrowserChildProcessObserver,
-                          public content::NotificationObserver {
- public:
-  // CrashDumpObserver client interface.
-  // Note: do not access the CrashDumpObserver singleton to add or
-  // remove clients from within client callbacks.
-  class Client {
-   public:
-    // Called on the launcher thread.
-    virtual void OnChildStart(int child_process_id,
-                              content::FileDescriptorInfo* mappings) = 0;
-    // Called on the blocking pool.
-    virtual void OnChildExit(int child_process_id,
-                             base::ProcessHandle pid,
-                             content::ProcessType process_type,
-                             base::TerminationStatus termination_status,
-                             base::android::ApplicationState app_state) = 0;
-
-   protected:
-    virtual ~Client() {}
-  };
-
-  static CrashDumpObserver* GetInstance();
-
-  void RegisterClient(Client* client);
-  void UnregisterClient(Client* client);
-
-  void BrowserChildProcessStarted(int child_process_id,
-                                  content::FileDescriptorInfo* mappings);
-
- private:
-  friend struct base::DefaultSingletonTraits<CrashDumpObserver>;
-
-  CrashDumpObserver();
-  ~CrashDumpObserver() override;
-
-  // content::BrowserChildProcessObserver implementation:
-  void BrowserChildProcessHostDisconnected(
-      const content::ChildProcessData& data) override;
-  void BrowserChildProcessCrashed(const content::ChildProcessData& data,
-                                  int exit_code) override;
-
-  // NotificationObserver implementation:
-  void Observe(int type,
-               const content::NotificationSource& source,
-               const content::NotificationDetails& details) override;
-
-  void OnChildExitOnBlockingPool(Client* client,
-                                 int child_process_id,
-                                 base::ProcessHandle pid,
-                                 content::ProcessType process_type,
-                                 base::TerminationStatus termination_status,
-                                 base::android::ApplicationState app_state);
-
-  // Called on child process exit (including crash).
-  void OnChildExit(int child_process_id,
-                   base::ProcessHandle pid,
-                   content::ProcessType process_type,
-                   base::TerminationStatus termination_status,
-                   base::android::ApplicationState app_state);
-
-  content::NotificationRegistrar notification_registrar_;
-
-  base::Lock registered_clients_lock_;
-  std::list<Client*> registered_clients_;
-
-  DISALLOW_COPY_AND_ASSIGN(CrashDumpObserver);
-};
-
-}  // namespace breakpad
-
-#endif  // COMPONENTS_CRASH_CONTENT_BROWSER_CRASH_DUMP_OBSERVER_ANDROID_H_