Revert of Change how the quota system computes the total poolsize for temporary storage

storage/browser/quota/usage_tracker.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/usage_tracker.h"
 
 #include <stdint.h>
 
 #include <algorithm>
 
@@ skipping 118 matching lines @@
 }
 
 void UsageTracker::UpdateUsageCache(QuotaClient::ID client_id,
                                     const GURL& origin,
                                     int64_t delta) {
   ClientUsageTracker* client_tracker = GetClientTracker(client_id);
   DCHECK(client_tracker);
   client_tracker->UpdateUsageCache(origin, delta);
 }
 
-int64_t UsageTracker::GetCachedUsage() const {
-  int64_t usage = 0;
-  for (const auto& client_id_and_tracker : client_tracker_map_)
-    usage += client_id_and_tracker.second->GetCachedUsage();
-  return usage;
-}
-
 void UsageTracker::GetCachedHostsUsage(
     std::map<std::string, int64_t>* host_usage) const {
   DCHECK(host_usage);
   host_usage->clear();
   for (const auto& client_id_and_tracker : client_tracker_map_)
     client_id_and_tracker.second->GetCachedHostsUsage(host_usage);
 }
 
 void UsageTracker::GetCachedOriginsUsage(
     std::map<GURL, int64_t>* origin_usage) const {
@@ skipping 64 matching lines @@
   // Defend against confusing inputs from clients.
   if (info->usage < 0)
     info->usage = 0;
 
   // All the clients have returned their usage data.  Dispatch the
   // pending callbacks.
   host_usage_callbacks_.Run(host, info->usage);
 }
 
 }  // namespace storage