[SystemInfo API] Rewrite storage info provider using storage monitor impl.

chrome/browser/extensions/api/system_info_storage/storage_info_observer.h

Index: chrome/browser/extensions/api/system_info_storage/storage_info_observer.h
diff --git a/chrome/browser/extensions/api/system_info_storage/storage_info_observer.h b/chrome/browser/extensions/api/system_info_storage/storage_info_observer.h
deleted file mode 100644
index 914a51a7ccd684ba7afe27321bd9a02464fb2838..0000000000000000000000000000000000000000
--- a/chrome/browser/extensions/api/system_info_storage/storage_info_observer.h
+++ /dev/null
@@ -1,35 +0,0 @@
-// Copyright 2013 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_SYSTEM_INFO_STORAGE_STORAGE_INFO_OBSERVER_H_
-#define CHROME_BROWSER_EXTENSIONS_API_SYSTEM_INFO_STORAGE_STORAGE_INFO_OBSERVER_H_
-
-#include "chrome/common/extensions/api/experimental_system_info_storage.h"
-
-namespace extensions {
-
-// Observes the changes happening on the storage devices, including free space
-// changes, storage arrival and removal.
-class StorageInfoObserver {
- public:
-  virtual ~StorageInfoObserver() {}
-
-  // Called when the storage free space changes.
-  virtual void OnStorageFreeSpaceChanged(const std::string& device_id,
-                                         double old_value,
-                                         double new_value) {}
-
-  // Called when a new removable storage device is attached.
-  virtual void OnStorageAttached(
-      const std::string& device_id,
-      api::experimental_system_info_storage::StorageUnitType type,
-      double capacity,
-      double available_capacity) {}
-
-  // Called when a removable storage device is detached.
-  virtual void OnStorageDetached(const std::string& device_id) {}
-};
-
-}  // namespace extensions
-
-#endif  // CHROME_BROWSER_EXTENSIONS_API_SYSTEM_INFO_STORAGE_STORAGE_INFO_OBSERVER_H_