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

storage/browser/quota/quota_settings.cc

-// Copyright 2016 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_settings.h"
-
-#include <algorithm>
-
-#include "base/metrics/histogram_macros.h"
-#include "base/sys_info.h"
-
-#define UMA_HISTOGRAM_MBYTES(name, sample)                                     \
-  UMA_HISTOGRAM_CUSTOM_COUNTS((name), static_cast<int>((sample) / kMBytes), 1, \
-                              10 * 1024 * 1024 /* 10TB */, 100)
-
-namespace storage {
-
-base::Optional<storage::QuotaSettings> CalculateNominalDynamicSettings(
-    const base::FilePath& partition_path,
-    bool is_incognito) {
-  const int64_t kMBytes = 1024 * 1024;
-
-  if (is_incognito) {
-    storage::QuotaSettings settings;
-    settings.pool_size =
-        std::min(300 * kMBytes, base::SysInfo::AmountOfPhysicalMemory() / 10);
-    settings.per_host_quota = settings.pool_size / 3;
-    settings.refresh_interval = base::TimeDelta::Max();
-    return settings;
-  }
-
-  // The fraction of the device's storage the browser is willing to
-  // use for temporary storage, this is applied after adjusting the
-  // total to take os_accomodation into account.
-  const double kTemporaryPoolSizeRatio = 1.0 / 3.0;  // 33%
-
-  // The fraction of the device's storage the browser attempts to
-  // keep free.
-  const double kMustRemainAvailableRatio = 0.1;
-
-  // Determines the portion of the temp pool that can be
-  // utilized by a single host (ie. 5 for 20%).
-  const int kPerHostTemporaryPortion = 5;
-
-  // os_accomodation is an estimate of how much storage is needed for
-  // the os and essential application code outside of the browser.
-  const int64_t kDefaultOSAccomodation =
-#if defined(OS_ANDROID)
-      1000 * kMBytes;
-#elif defined(OS_CHROMEOS)
-      1000 * kMBytes;
-#elif defined(OS_WIN) || defined(OS_LINUX) || defined(OS_MACOSX)
-      10000 * kMBytes;
-#else
-#error "Port: Need to define an OS accomodation value for unknown OS."
-#endif
-
-  storage::QuotaSettings settings;
-
-  int64_t total = base::SysInfo::AmountOfTotalDiskSpace(partition_path);
-  if (total == -1) {
-    LOG(ERROR) << "Unable to compute QuotaSettings.";
-    return base::nullopt;
-  }
-
-  // If our hardcoded OS accomodation is too large for the volume size, define
-  // the value as a fraction of the total volume size instead.
-  int64_t os_accomodation =
-      std::min(kDefaultOSAccomodation, static_cast<int64_t>(total * 0.8));
-  UMA_HISTOGRAM_MBYTES("Quota.OSAccomodationDelta",
-                       kDefaultOSAccomodation - os_accomodation);
-
-  int64_t adjusted_total = total - os_accomodation;
-  int64_t pool_size = adjusted_total * kTemporaryPoolSizeRatio;
-
-  settings.pool_size = pool_size;
-  settings.must_remain_available = total * kMustRemainAvailableRatio;
-  settings.per_host_quota = pool_size / kPerHostTemporaryPortion;
-  settings.refresh_interval = base::TimeDelta::FromSeconds(60);
-  return settings;
-}
-
-}  // namespace