avoid GCC content::CacheStorage::kSizeUnknown redeclaration error

content/browser/cache_storage/cache_storage_index.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 "content/browser/cache_storage/cache_storage_index.h"
 
 #include <utility>
 
 namespace content {
 
 CacheStorageIndex::CacheStorageIndex()
-    : doomed_cache_metadata_("", CacheStorage::kSizeUnknown) {
+    : doomed_cache_metadata_("", kCacheStorageSizeUnknown) {
   ClearDoomedCache();
 }
 
 CacheStorageIndex::~CacheStorageIndex() = default;
 
 CacheStorageIndex& CacheStorageIndex::operator=(CacheStorageIndex&& rhs) {
   DCHECK(!has_doomed_cache_);
   ordered_cache_metadata_ = std::move(rhs.ordered_cache_metadata_);
   cache_metadata_map_ = std::move(rhs.cache_metadata_map_);
   storage_size_ = rhs.storage_size_;
-  rhs.storage_size_ = CacheStorage::kSizeUnknown;
+  rhs.storage_size_ = kCacheStorageSizeUnknown;
   return *this;
 }
 
 void CacheStorageIndex::Insert(const CacheMetadata& cache_metadata) {
   DCHECK(!has_doomed_cache_);
   DCHECK(cache_metadata_map_.find(cache_metadata.name) ==
          cache_metadata_map_.end());
   ordered_cache_metadata_.push_back(cache_metadata);
   cache_metadata_map_[cache_metadata.name] = --ordered_cache_metadata_.end();
-  storage_size_ = CacheStorage::kSizeUnknown;
+  storage_size_ = kCacheStorageSizeUnknown;
 }
 
 void CacheStorageIndex::Delete(const std::string& cache_name) {
   DCHECK(!has_doomed_cache_);
   auto it = cache_metadata_map_.find(cache_name);
   DCHECK(it != cache_metadata_map_.end());
   ordered_cache_metadata_.erase(it->second);
   cache_metadata_map_.erase(it);
-  storage_size_ = CacheStorage::kSizeUnknown;
+  storage_size_ = kCacheStorageSizeUnknown;
 }
 
 bool CacheStorageIndex::SetCacheSize(const std::string& cache_name,
                                      int64_t size) {
   if (has_doomed_cache_)
     DCHECK_NE(cache_name, doomed_cache_metadata_.name);
   auto it = cache_metadata_map_.find(cache_name);
   DCHECK(it != cache_metadata_map_.end());
   if (it->second->size == size)
     return false;
   it->second->size = size;
-  storage_size_ = CacheStorage::kSizeUnknown;
+  storage_size_ = kCacheStorageSizeUnknown;
   return true;
 }
 
 int64_t CacheStorageIndex::GetCacheSize(const std::string& cache_name) const {
   const auto& it = cache_metadata_map_.find(cache_name);
   if (it == cache_metadata_map_.end())
-    return CacheStorage::kSizeUnknown;
+    return kCacheStorageSizeUnknown;
   return it->second->size;
 }
 
 int64_t CacheStorageIndex::GetStorageSize() {
-  if (storage_size_ == CacheStorage::kSizeUnknown)
+  if (storage_size_ == kCacheStorageSizeUnknown)
     UpdateStorageSize();
   return storage_size_;
 }
 
 void CacheStorageIndex::UpdateStorageSize() {
   int64_t storage_size = 0;
-  storage_size_ = CacheStorage::kSizeUnknown;
+  storage_size_ = kCacheStorageSizeUnknown;
   for (const CacheMetadata& info : ordered_cache_metadata_) {
-    if (info.size == CacheStorage::kSizeUnknown)
+    if (info.size == kCacheStorageSizeUnknown)
       return;
     storage_size += info.size;
   }
   storage_size_ = storage_size;
 }
 
 void CacheStorageIndex::DoomCache(const std::string& cache_name) {
   DCHECK(!has_doomed_cache_);
   auto map_it = cache_metadata_map_.find(cache_name);
   DCHECK(map_it != cache_metadata_map_.end());
   doomed_cache_metadata_ = std::move(*(map_it->second));
   after_doomed_cache_metadata_ = ordered_cache_metadata_.erase(map_it->second);
   cache_metadata_map_.erase(map_it);
-  storage_size_ = CacheStorage::kSizeUnknown;
+  storage_size_ = kCacheStorageSizeUnknown;
   has_doomed_cache_ = true;
 }
 
 void CacheStorageIndex::FinalizeDoomedCache() {
   DCHECK(has_doomed_cache_);
   ClearDoomedCache();
 }
 
 void CacheStorageIndex::RestoreDoomedCache() {
   DCHECK(has_doomed_cache_);
   const auto cache_name = doomed_cache_metadata_.name;
   cache_metadata_map_[cache_name] = ordered_cache_metadata_.insert(
       after_doomed_cache_metadata_, std::move(doomed_cache_metadata_));
   after_doomed_cache_metadata_ = ordered_cache_metadata_.end();
-  storage_size_ = CacheStorage::kSizeUnknown;
+  storage_size_ = kCacheStorageSizeUnknown;
   ClearDoomedCache();
 }
 
 void CacheStorageIndex::ClearDoomedCache() {
   doomed_cache_metadata_.name.clear();
   after_doomed_cache_metadata_ = ordered_cache_metadata_.end();
   has_doomed_cache_ = false;
 }
 
 }  // namespace content