ExtensionStorageMonitor: use smaller, self-registering StorageObservers

storage/browser/quota/quota_manager.cc

 // 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.
 
 #include "storage/browser/quota/quota_manager.h"
 
 #include <stddef.h>
 #include <stdint.h>
 
 #include <algorithm>
@@ skipping 1091 matching lines @@
     StorageObserver* observer, const StorageObserver::MonitorParams& params) {
   DCHECK(observer);
   storage_monitor_->AddObserver(observer, params);
 }
 
 void QuotaManager::RemoveStorageObserver(StorageObserver* observer) {
   DCHECK(observer);
   storage_monitor_->RemoveObserver(observer);
 }
 
-void QuotaManager::RemoveStorageObserverForFilter(
-    StorageObserver* observer, const StorageObserver::Filter& filter) {
-  DCHECK(observer);
-  storage_monitor_->RemoveObserverForFilter(observer, filter);
-}
-
 QuotaManager::~QuotaManager() {
   proxy_->manager_ = NULL;
   for (auto* client : clients_)
     client->OnQuotaManagerDestroyed();
   if (database_)
     db_thread_->DeleteSoon(FROM_HERE, database_.release());
 }
 
 QuotaManager::EvictionContext::EvictionContext()
     : evicted_type(kStorageTypeUnknown) {
@@ skipping 557 matching lines @@
 }
 
 // static
 std::tuple<int64_t, int64_t> QuotaManager::GetVolumeInfo(
     const base::FilePath& path) {
   return std::make_tuple(base::SysInfo::AmountOfTotalDiskSpace(path),
                          base::SysInfo::AmountOfFreeDiskSpace(path));
 }
 
 }  // namespace storage