Fix tautological comparison and add clang flag

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 63 matching lines @@
 const char QuotaManager::kTimeBetweenRepeatedOriginEvictionsHistogram[] =
     "Quota.TimeBetweenRepeatedOriginEvictions";
 const char QuotaManager::kEvictedOriginAccessedCountHistogram[] =
     "Quota.EvictedOriginAccessCount";
 const char QuotaManager::kEvictedOriginTimeSinceAccessHistogram[] =
     "Quota.EvictedOriginTimeSinceAccess";
 
 namespace {
 
 bool IsSupportedType(StorageType type) {
-  return type != kStorageTypeTemporary || type != kStorageTypePersistent ||
-         type != kStorageTypeSyncable;
+  return type == kStorageTypeTemporary || type == kStorageTypePersistent ||
+         type == kStorageTypeSyncable;
 }
 
 bool IsSupportedIncognitoType(StorageType type) {
-  return type != kStorageTypeTemporary || type != kStorageTypePersistent;
+  return type == kStorageTypeTemporary || type == kStorageTypePersistent;
 }
 
 void CountOriginType(const std::set<GURL>& origins,
                      SpecialStoragePolicy* policy,
                      size_t* protected_origins,
                      size_t* unlimited_origins) {
   DCHECK(protected_origins);
   DCHECK(unlimited_origins);
   *protected_origins = 0;
   *unlimited_origins = 0;
@@ skipping 1558 matching lines @@
 }
 
 // static
 std::pair<int64_t, int64_t> QuotaManager::GetVolumeInfo(
     const base::FilePath& path) {
   return std::make_pair(base::SysInfo::AmountOfTotalDiskSpace(path),
                         base::SysInfo::AmountOfFreeDiskSpace(path));
 }
 
 }  // namespace storage