avoid GCC content::CacheStorage::kSizeUnknown redeclaration error

content/browser/cache_storage/cache_storage_manager.cc

Index: content/browser/cache_storage/cache_storage_manager.cc
diff --git a/content/browser/cache_storage/cache_storage_manager.cc b/content/browser/cache_storage/cache_storage_manager.cc
index 362b8e923aa9647ed627835cf7e287fc9446da00..2b4ae3e75e776fe158a9f0b010942c912e87e7a0 100644
--- a/content/browser/cache_storage/cache_storage_manager.cc
+++ b/content/browser/cache_storage/cache_storage_manager.cc
@@ -51,14 +51,15 @@ void DeleteOriginDidDeleteDir(
                                          : storage::kQuotaErrorAbort));
 }
 
-// Calculate the sum of all cache sizes in this store, but only if all sizes are
-// known. If one or more sizes are not known then return kSizeUnknown.
+// Calculate the sum of all cache sizes in this store, but only if all
+// sizes are known. If one or more sizes are not known then return
+// kCacheStorageSizeUnknown.
 int64_t GetCacheStorageSize(const proto::CacheStorageIndex& index) {
   int64_t storage_size = 0;
   for (int i = 0, max = index.cache_size(); i < max; ++i) {
     const proto::CacheStorageIndex::Cache& cache = index.cache(i);
-    if (!cache.has_size() || cache.size() == CacheStorage::kSizeUnknown)
-      return CacheStorage::kSizeUnknown;
+    if (!cache.has_size() || cache.size() == kCacheStorageSizeUnknown)
+      return kCacheStorageSizeUnknown;
     storage_size += cache.size();
   }
   return storage_size;
@@ -86,7 +87,7 @@ void ListOriginsAndLastModifiedOnTaskRunner(
     if (index.ParseFromString(protobuf)) {
       if (index.has_origin()) {
         if (base::GetFileInfo(path, &file_info)) {
-          int64_t storage_size = CacheStorage::kSizeUnknown;
+          int64_t storage_size = kCacheStorageSizeUnknown;
           if (file_info.last_modified < index_last_modified)
             storage_size = GetCacheStorageSize(index);
           usages->push_back(CacheStorageUsageInfo(
@@ -137,7 +138,7 @@ void OneOriginSizeReported(const base::Closure& callback,
                            int64_t size) {
   DCHECK_CURRENTLY_ON(BrowserThread::IO);
 
-  DCHECK_NE(size, CacheStorage::kSizeUnknown);
+  DCHECK_NE(size, kCacheStorageSizeUnknown);
   usage->total_size_bytes = size;
   base::ThreadTaskRunnerHandle::Get()->PostTask(FROM_HERE, callback);
 }
@@ -297,7 +298,7 @@ void CacheStorageManager::GetAllOriginsUsageGetSizes(
                  callback));
 
   for (CacheStorageUsageInfo& usage : *usages_ptr) {
-    if (usage.total_size_bytes != CacheStorage::kSizeUnknown) {
+    if (usage.total_size_bytes != kCacheStorageSizeUnknown) {
       base::ThreadTaskRunnerHandle::Get()->PostTask(FROM_HERE, barrier_closure);
       continue;
     }