Added quota_status_code.h/cc file to hold QuotaStatusCode enum and added function to convert enum t…

chrome/browser/extensions/api/sync_file_system/sync_file_system_api.cc

Index: chrome/browser/extensions/api/sync_file_system/sync_file_system_api.cc
diff --git a/chrome/browser/extensions/api/sync_file_system/sync_file_system_api.cc b/chrome/browser/extensions/api/sync_file_system/sync_file_system_api.cc
index 8f919bbb5a7f248ffdc8307da740c520c5615748..6e8a96f847e73f295fe45dc126b2f58308658a10 100644
--- a/chrome/browser/extensions/api/sync_file_system/sync_file_system_api.cc
+++ b/chrome/browser/extensions/api/sync_file_system/sync_file_system_api.cc
@@ -188,10 +188,8 @@ void SyncFileSystemGetUsageAndQuotaFunction::DidGetUsageAndQuota(
   }
 
   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
-  // TODO(calvinlo): Convert QuotaStatusCode to error string
-  // (http://crbug.com/156791).
   if (status != quota::kQuotaStatusOk) {
-    error_ = base::StringPrintf(kQuotaError, static_cast<int>(status));
+    error_ = QuotaStatusCodeToString(status);
     SendResponse(false);
     return;
   }