storage: Use stl utilities from the base namespace

storage/browser/fileapi/file_system_usage_cache.cc

Index: storage/browser/fileapi/file_system_usage_cache.cc
diff --git a/storage/browser/fileapi/file_system_usage_cache.cc b/storage/browser/fileapi/file_system_usage_cache.cc
index 8b6ec2236ce65b1696088c14bf5df894c577f241..44d291fc60aa48378beb2df5eca427bc3c751a62 100644
--- a/storage/browser/fileapi/file_system_usage_cache.cc
+++ b/storage/browser/fileapi/file_system_usage_cache.cc
@@ -161,7 +161,7 @@ bool FileSystemUsageCache::Delete(const base::FilePath& usage_file_path) {
 void FileSystemUsageCache::CloseCacheFiles() {
   TRACE_EVENT0("FileSystem", "UsageCache::CloseCacheFiles");
   DCHECK(CalledOnValidThread());
-  STLDeleteValues(&cache_files_);
+  base::STLDeleteValues(&cache_files_);
   timer_.reset();
 }
 
@@ -300,7 +300,7 @@ bool FileSystemUsageCache::CalledOnValidThread() {
 bool FileSystemUsageCache::HasCacheFileHandle(const base::FilePath& file_path) {
   DCHECK(CalledOnValidThread());
   DCHECK_LE(cache_files_.size(), kMaxHandleCacheSize);
-  return ContainsKey(cache_files_, file_path);
+  return base::ContainsKey(cache_files_, file_path);
 }
 
 }  // namespace storage