ExtensionStorageMonitor: use smaller, self-registering StorageObservers

storage/browser/quota/quota_manager.h

 // 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 STORAGE_BROWSER_QUOTA_QUOTA_MANAGER_H_
 #define STORAGE_BROWSER_QUOTA_QUOTA_MANAGER_H_
 
 #include <stdint.h>
 
 #include <deque>
@@ skipping 206 matching lines @@
   virtual void GetOriginsModifiedSince(StorageType type,
                                        base::Time modified_since,
                                        const GetOriginsCallback& callback);
 
   bool ResetUsageTracker(StorageType type);
 
   // Used to register/deregister observers that wish to monitor storage events.
   void AddStorageObserver(StorageObserver* observer,
                           const StorageObserver::MonitorParams& params);
   void RemoveStorageObserver(StorageObserver* observer);
-  void RemoveStorageObserverForFilter(StorageObserver* observer,
-                                      const StorageObserver::Filter& filter);
 
   static const int64_t kPerHostPersistentQuotaLimit;
   static const char kDatabaseName[];
   static const int kThresholdOfErrorsToBeBlacklisted;
   static const int kEvictionIntervalInMilliSeconds;
   static const char kDaysBetweenRepeatedOriginEvictionsHistogram[];
   static const char kEvictedOriginAccessedCountHistogram[];
   static const char kEvictedOriginDaysSinceAccessHistogram[];
 
   // Kept non-const so that test code can change the value.
@@ skipping 229 matching lines @@
 
 struct QuotaManagerDeleter {
   static void Destruct(const QuotaManager* manager) {
     manager->DeleteOnCorrectThread();
   }
 };
 
 }  // namespace storage
 
 #endif  // STORAGE_BROWSER_QUOTA_QUOTA_MANAGER_H_